The VL is too big to go through small caves etc.

Some Dawnguard quests you've got to go through them. It is really annoying to switch from VL to normal form all the time

its the same with werewolfs but whats worse is that in some caves you can enter fine but if theres a slope to the exit then you get stuck even sprinting dont work

Yeah, and you can't even go through with bat form

in the black briar mansion in werewolf form you cant even go down stairs or enter or exit even if you have the key

Dev oversight.

Switching back might not be necessary simply ceasing to hover and walking may be enough.

Inescapable result from growing tall and hovering a few feet in the air.

Nope, even if I walk it doesn't work. It's like some kind of invisible wall

Apparently Vampire Lords and Werewolves don't know how to crouch.

Or maybe making crouching actually work like a height difference.