I tried to use them but haven't really stuck with it.
I think it's domain dependent.
It's easy to recall things you encounter frequently, and difficult to recall things which are rarely encountered. Failing to recall something means taking the time to look it up.
With spaced repetition, you're making the bet that it's worth spending some time in order to improve recall for a bunch of stuff. -- The surprise is how much value you can get for how little it can cost.
It's likely a good bet for stuff like language learning (or healthsci), where there's a long tail of things you'd like to be able to recall quickly, and 'cost' of looking something up is quite high. (It's not a fluid conversation if you have to bring out a dictionary).
Whereas with e.g. programming, you're often spending time looking stuff up anyway.
I know two students who did quite well on step one and step two, but I do not believe they are using Anki now in their residency