Cleanup with updated macros

Marlin/src/feature/bedlevel/bedlevel.cpp

 #endif
 
 bool leveling_is_valid() {
-  return
-    #if ENABLED(MESH_BED_LEVELING)
-      mbl.has_mesh()
-    #elif ENABLED(AUTO_BED_LEVELING_BILINEAR)
-      !!bilinear_grid_spacing.x
-    #elif ENABLED(AUTO_BED_LEVELING_UBL)
-      ubl.mesh_is_valid()
-    #else // 3POINT, LINEAR
-      true
-    #endif
-  ;
+  return TERN1(MESH_BED_LEVELING,          mbl.has_mesh())
+      && TERN1(AUTO_BED_LEVELING_BILINEAR, !!bilinear_grid_spacing.x)
+      && TERN1(AUTO_BED_LEVELING_UBL,      ubl.mesh_is_valid());
 }
 
 /**
  */
 void set_bed_leveling_enabled(const bool enable/*=true*/) {
 
-  #if ENABLED(AUTO_BED_LEVELING_BILINEAR)
-    const bool can_change = (!enable || leveling_is_valid());
-  #else
-    constexpr bool can_change = true;
-  #endif
+  const bool can_change = TERN1(AUTO_BED_LEVELING_BILINEAR, !enable || leveling_is_valid());
 
   if (can_change && enable != planner.leveling_active) {
 

Marlin/src/lcd/extui/ui_api.cpp

 
 #if ENABLED(SDSUPPORT)
   #include "../../sd/cardreader.h"
-  #define IFSD(A,B) (A)
-#else
-  #define IFSD(A,B) (B)
 #endif
 
 #if HAS_TRINAMIC_CONFIG
   }
 
   void yield() {
-    if (!flags.printer_killed)
-      thermalManager.manage_heater();
+    if (!flags.printer_killed) thermalManager.manage_heater();
   }
 
   void enableHeater(const extruder_t extruder) {
     #if HEATER_IDLE_HANDLER
       switch (heater) {
         #if HAS_HEATED_BED
-          case BED:
-            thermalManager.reset_bed_idle_timer();
-            return;
-        #endif
-        #if HAS_HEATED_CHAMBER
-          case CHAMBER: return; // Chamber has no idle timer
+          case BED: thermalManager.reset_bed_idle_timer(); return;
         #endif
+        TERN_(HAS_HEATED_CHAMBER, case CHAMBER: return); // Chamber has no idle timer
         default:
           TERN_(HAS_HOTEND, thermalManager.reset_hotend_idle_timer(heater - H0));
           break;
   #endif
 
   bool isHeaterIdle(const extruder_t extruder) {
-    return false
-      #if HAS_HOTEND && HEATER_IDLE_HANDLER
-        || thermalManager.hotend_idle[extruder - E0].timed_out
-      #else
-        ; UNUSED(extruder)
-      #endif
-    ;
+    #if HAS_HOTEND && HEATER_IDLE_HANDLER
+      return thermalManager.hotend_idle[extruder - E0].timed_out
+    #else
+      UNUSED(extruder);
+      return false;
+    #endif
   }
 
   bool isHeaterIdle(const heater_t heater) {
     #if HEATER_IDLE_HANDLER
       switch (heater) {
         TERN_(HAS_HEATED_BED, case BED: return thermalManager.bed_idle.timed_out);
-        #if HAS_HEATED_CHAMBER
-          case CHAMBER: return false; // Chamber has no idle timer
-        #endif
+        TERN_(HAS_HEATED_CHAMBER, case CHAMBER: return false); // Chamber has no idle timer
         default:
-          #if HAS_HOTEND
-            return thermalManager.hotend_idle[heater - H0].timed_out;
-          #else
-            return false;
-          #endif
+          return TERN0(HAS_HOTEND, thermalManager.hotend_idle[heater - H0].timed_out);
       }
     #else
       UNUSED(heater);
   }
 
   float getAxisPosition_mm(const axis_t axis) {
-    return
-      #if ENABLED(JOYSTICK)
-        flags.jogging ? destination[axis] :
-      #endif
-      current_position[axis];
+    return TERN_(JOYSTICK, flags.jogging ? destination[axis] :) current_position[axis];
   }
 
   float getAxisPosition_mm(const extruder_t extruder) {
     const extruder_t old_tool = getActiveTool();
     setActiveTool(extruder, true);
-    const float epos = (
-      #if ENABLED(JOYSTICK)
-        flags.jogging ? destination.e :
-      #endif
-      current_position.e
-    );
+    const float epos = TERN_(JOYSTICK, flags.jogging ? destination.e :) current_position.e;
     setActiveTool(old_tool, true);
     return epos;
   }
   }
 
   bool FileList::isAtRootDir() {
-    return (true
-      #if ENABLED(SDSUPPORT)
-        && card.flag.workDirIsRoot
-      #endif
-    );
+    return IFSD(card.flag.workDirIsRoot, true);
   }
 
   void FileList::upDir() {

Marlin/src/sd/cardreader.h

 #endif
 
 #define SD_ORDER(N,C) (TERN(SDCARD_RATHERRECENTFIRST, C - 1 - (N), N))
+#define IFSD(A,B) TERN(SDSUPPORT,A,B)
 
 #define MAX_DIR_DEPTH     10       // Maximum folder depth
 #define MAXDIRNAMELENGTH   8       // DOS folder name size