I'm utterly torn between ido and helm. I like that ido has a small popup, preserving window layout, but helm is great for large datasets.
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For hobby projects, I really like software where I can do small features or tweaks. Sometimes I don't have time for anything more substantial.
Website projects are great for this. Are there other areas?
If you created a large, successful OSS project, would you want to be BDFL or move on after a period?
I see tradeoffs on both sides, although it's not a decision I've needed to make myself.
It's really satisfying to use a profiler for the first time on a project. I always find a big performance win with only a small code change.
It's never the code that I expected to be slow, however!