It's nice in Netbeans, because I can see which lines I've changed while I'm editing, and if I hover over the sidebar it will show me what I've changed or deleted. Probably they all do that, but Netbeans is the only IDE I bother with.

I won't say it's indispensable, but it is handy. I don't miss it outside of Netbeans though.

Jetbrains integrates them so freakin well - it's hard not to use them