[szemet]

The only thing what makes modal editing bearable (from UX PoV) is the unlimited undo.

e.g. Would anyone take a plane that has modal cockpit buttons?

[xenomachina]

All editors are modal, just to different extents. In Notepad, if you type a letter it inserts it, unless you have some text highlighted, in which case it replaces that text. "Some text is selected" is a mode.

The big thing that classic vi got wrong with modes from a usability perspective is that changing modes is mostly invisible. In vim, however, you can configure it to change the cursor shape in different modes, and this is a pretty effective cue. (It's also the default behavior in gvim.)

[Cyph0n]

What does flying a plane have to do with editing and navigating code?

[szemet]

It happens me every day: I just start to type while still in command mode, and then have to press "u" a couple of times.

(But ok, thats maybe just me - thought this is a common experience, and I just wouldn't like to sit behind a pilot doing the same...)

[chongli]

This problem can be mitigated to an extent with a vim setting to change the cursor from a block to a vertical line when you enter insert mode. After using it for a bit your brain will learn to look for the vertical line before typing.

[pvg]

This sort of thing has been a factor in airplane accidents - pilots becoming confused about stuff like the automation regime they're in.