You're right (but you only have to do it once!)
It's also quite tech oriented (look at what's 'popular'), although obviously you are using it personally to tag whatever you like.
I've had a look at furl (I remember now why I didn't try it before - once you've got one tagging system on your toolbar, why would you want to install more?) and judging from the pre-loaded topics, it seems more 'general interest'. For that reason I would guess it might carry more weight with any SE that was interested...if they are