Your top 5 plugins?
Well, right now I don't use it.
But if I did I would use it to create new pages with special templates, then I can format a home page with all the buttons, and dataview queries to sort and organize the new pages.
Something like a journal where a button might be "Daily entry" and another for "New Project Page" or "New Task" or something.
It also might work really well for taking notes in DnD. (Quick "new character/place/item page" buttons right in the session notes page.) I'll have to experiment with templates again this summer.
Your top 5 plugins?
I don't have a complex enough workflow to need a lot of plugins, but I really really like Dataview. Templater and Buttons will probably be really high on my list too if I get around to actually using them.