Sure, but my IDE does these simple things very well.

Just some important things off the top of my head that I use daily:

* Instantly jumping between definitions and usages

* Folding and unfolding code blocks

* Quick overview of structures in files

* Database access, so I can browse the data and the code at the same time

Also, sometimes I just want to quickly refactor/rename some variable across all its usages or whatever. It's just quicker to do it in the IDE with a simple keyboard shortcut, rather than prompting an agent "rename oldName to newName".