Vim (and recently neovim) has been my editor for around 14 years now! That's about seven hours in this editor every day, and I still find the mouse very convenient for a lot of the moves where the destination cannot be described with one or two keys. I like the idea of this plugin but I don't think it will be a big leap over the use of mouse!
I've been using nvim for around 5 years for everything I do on a computer other than web browsing. It feels like I'm missing something here, but why would you ever need a mouse within your terminal? I don't recall never ever needing it :/
Cut and paste.
I use tmux to do cut and paste, but should I ever need something out of the terminal/browser into the other, or don’t feel like C-b] ‘ing something, the mouse is great.
If your terminal supports it (iterm, kitty, later versions of gnome-terminal and others) this osc52 plugin is really sweet. It even works over ssh.