Thanks everyone for the responses.
To the suggestion of using an iPhone, I do. Part of the reason I wanted to move on was that I tended to use my iPhone 4S much more frequently than the S90. It's just simpler and more immediate, and HDR and panorama work easily.
Regarding pocketability, it can be carried in a pocket, but not comfortably when hiking or walking all day since it swings heavily in the pocket. Realistically, it needs to be carried like any other camera.
After some thought, I decided to keep the S90 and try to understand it better, be more deliberate and become more proficient in using it. When I owned my first SLR, I walked around with a light meter and thought about every aspect of a shot. I should have the same attitude with my latest camera, even if it requires learning all kinds of new ways. I also have never actually worked with RAW, an area I should explore. I used to develop and print my photos, I can do this.
I think I would be more satisfied when I truly outgrow the S90 before paying for a new model. And new models just keep getting better for when I'm ready.
I'll stick with the S90 a little longer.