Just got my 90mm TS-E in the mail yesterday and I can tell I'm going to have a lot of fun learning how to use it to its full potential. Here's my first shot with it at maximum tilt, f/16 @ ISO 100:
Oh, I suspect you'll have a fun, indeed! Being able to control the plane of sharpest focus is a powerful tool. It very good for table top and macro work and also useful for landscape and other work. If I had one I'd want it for portraits.
Makes me nostalgic for using my view camera, now in the garage gathering dust.