I use the following:

• AppIndicator/KStatusNotifierItem support(Most apps rely on trays so this is useful)
• Clipboard Indicator(I wish Gnome natively had this but its fine Cinnamon doesnt to)
• Desktop Logo
• gtile(I want a tiling window manager like thing for Gnome i heard its faster)
• Quick Settings Audio Panel
• GSConnect (Looks better,Integrates better with GNOME)
• Alphabetical App Grid
• Arch LINUX Updater
• Removable Drive Menu

i created this cause i wonder who uses Gnome on the Fediverse without plugins and maybe Gnome Tweaks and i may find some useful extensions here
Also Cinnamon users may count aswell but idk this is primary focused on GNOME
i also like my GNOME almost stock