Wait, no one mentions the default JetBrains IDE git UI? I mean, I get it if you're working from another IDE/text editor that doesn't have good git UI support out of the box, but JB's git UI is reasonably good enough that I don't want anything else.
Things that I use (and I like):
1. quick checkout to another branch and automatically stash and unstash your local changes; when I just need to inspect code elsewhere I find it really useful. My changes are small so I can always remember to stash them later;
2. compare branch/commit etc via UI; again I know you can do that in git diff, but then you would need to know the command and the commit SHA to compare; in UI it comes in really handy, just select the branch or commits you want to compare and that's it. I've seen my coworkers trying to come up with the command and I just say: use IDE and a couple of clicks they got it working.
3. filter commits by user and by folder.
Things that I use (and I like): 1. quick checkout to another branch and automatically stash and unstash your local changes; when I just need to inspect code elsewhere I find it really useful. My changes are small so I can always remember to stash them later; 2. compare branch/commit etc via UI; again I know you can do that in git diff, but then you would need to know the command and the commit SHA to compare; in UI it comes in really handy, just select the branch or commits you want to compare and that's it. I've seen my coworkers trying to come up with the command and I just say: use IDE and a couple of clicks they got it working. 3. filter commits by user and by folder.