I think just as important as ctrl-s’ing all the time is remembering to make backups as you go. Yes, Hammer does autosaves, but it’s still something you should do yourself every so often. Just go and copy-paste the file on itself and Windows will add “copy” and a number.
I used to have the Flag tab crash all the time, but it hasn’t happened in months. The Model Browser “crash” still sucks. I’ve never heard of clicking in a 2D view and retrying to fix it. Worth a shot the next time it happens.
I don’t have many problems with outright crashes. I did notice that Bravado blew a gasket at some point on my old PC where every Object Properties seemed like it had to update and redraw itself for a second every time I clicked on something else. Brought production to a crawl.