I've not actually used the file explorer much, but I've seen that it's there. I assume it can't do file moves or deletes, though? That's the one thing I really miss from file pickers in other tools, otherwise I find the fuzzy search approach really convenient.

I should definitely use the buffer picker more, at the moment I use the gn/gb commands and it mostly works, but then I suddenly end up with too many open buffers and it's hard to figure out where I need to go again.