There's some minor things that iTerm2 does that I like:

You can hold down command and click URLs to open them. (You can actually kinda do this in Terminal.app as well by right-clicking a URL and choosing to open it, but it's a bit fiddlier, and I got used to the hover feedback in iTerm2.)

You can click to highlight entire blocks of output from commands, which I sometimes find handy when things feel like they're blending together.

It'll keep a floating copy of the previous command prompt at the top of the screen so you can see what led to whatever output is currently at the top.

None of these are essential, for sure.