I do all of the same in emacs (and vim), and because I use doom-emacs I get all this basically for free without much configuration on my end.
- Go-to-definition is `g d` (with the cursor over the function name in question)
- Project-wide file search is `SPC SPC`
- Jumping to a function is `SPC s i` and then just start typing to fuzzy-match the function name
I stick with this setup because it does pretty much everything I could want from IDEA, and does it without churning up most of the resources on my machine. And trust me, I've tried to switch to IDEA, but it's just too big and too slow, and too poor of an editor for me to actually make the switch.
- Go-to-definition is `g d` (with the cursor over the function name in question)
- Project-wide file search is `SPC SPC`
- Jumping to a function is `SPC s i` and then just start typing to fuzzy-match the function name
I stick with this setup because it does pretty much everything I could want from IDEA, and does it without churning up most of the resources on my machine. And trust me, I've tried to switch to IDEA, but it's just too big and too slow, and too poor of an editor for me to actually make the switch.