I hardly used mine until halfway into the trip. In all honesty, I just didn't know how or when to use it. After about a week I did a lens a day challenge, just for fun where I would pick one lens, and use that all/most of the day. It was only then that I got a real feel for the UWA (I have the tokina 11-16) and had I done this sooner I think I would have used it a LOT more.
I agree it's not ideal as a portrait lens but it can work nicely for parades if you are standing right at the kerb as the characters do play to cameras if they spot you.
http://www.flickr.com/photos/2tiggies/8127555346/
Untitled by
2Tiggies, on Flickr
http://www.flickr.com/photos/2tiggies/8127556654/
Shovel! by
2Tiggies, on Flickr
As for the gorgeous landscape and creative photos the folk post on here taken with their UWA lenses ..... well I didn't get any of those
I've kept the lens in any event because it's a great lens; I just recognized through the experience that I need to learn how and when to use it before I decide if it's right for me.