Using GVim and VsVim all day where the integration/functionality is almost perfect and then switching to the linqpad editor is painful. Lots of actions dont' work the same way in linqpad that work in vim, some examples:
Visual mode select then x to delete
Visual mode select then y to yank
No option to yank/paste using clipboard
Many dot commands like replace ending ; to , with A<-, don't work
Braces navigation using %
Visual mode navigation, example V then Ctrl+d
Visual block mode doesn't work
The list could go on, these are just some examples I run into every day