Dell U2412M has two configurable physical buttons. So I can immediately switch between VGA / DVI or DVI / DisplayPort by pressing button twice and it's super handy for my VMs with GPU passthrough. I might guess other DELL monitors have the same option.

What beyond me is that monitor firmware almost never have sanity check on input source switching. So every time I use wrong button I have to wait 2-3 seconds when it's attempting to switch to already active input.