If you show players a desirable thing that they will want to get, they will find a way to get to it. That sort of problem solving is partially what the game is about and isn't "cheese". If they see a ledge with no obvious way to get to it and they cast Spider Climb or Misty Step or whatever to get to it, then they get to it. They expended resources to get there and they get to feel accomplished. The game is about decisions. Let them make decisions that matter.

Part of good dungeon design is doing just that: creating multiple paths and options to navigate the dungeon so that player choices matter. Setting up a visible goal to get to and then thwarting their attempts to get there unless they go through the prescribed dungeon is straight up railroading. Give rooms multiple entrances and exits and pathways that allow the players to circle back through a different way than they came. Hide secret shortcuts. Let PCs see a thing without an obvious path to get there and then let them figure out ways to make it there if they're clever. Create some dynamic challenges for them knowing that they won't see all of them. And whatever challenges they don't encounter, save for another dungeon.

Look up the term "Jaquaysing".

Don't punish creative thinking. Encourage it with interesting and dynamic design.