The thing you're missing from that list is thingist, which is my "lists" app.
Yes, it does provide value. Thingist has become my, and the few other people that have run into it's:
Photo sharing site
Bookmarking site
Music playlist site
Shopping list
Link aggregator
Blogging platform
Etc.
I've been keeping "songs I like" for almost two years, and it has replaced grooveshark or spotify for me.
So yes, lists do provide value.
(sadly I haven't worked on thingist much in the last few months. Depression is a bitch like that)