I've been shooting a Cambo WDS w/ a P25 for a few years now. I do mostly architecture and interiors with it. I battled with many of the same questions being kicked around here before I got it. I'll throw out a few ideas, take them for what they are worth:
1) I shoot an LCC after every shot. I've got a 35, 47 and 72. The 35 and 47 seem to need it - Can't see any cast whatsoever with the 72 (but I take one anyway). I like how, when scrolling through the frames on the laptop, it divides the series of shots. It's so not a big deal - just keep the card in my pocket, open up 2 stops, shoot it and I'm done. I tried keeping a library, but am far to absent minded to keep track of how much shift I did for every shot. Again, it's no big deal, takes all of 15 seconds (with decent light anyway...).
2) I tried the hartblie on my contax 645. I tried the Canon t/s. There is just no comparison, the Schniders and Rhodenstocks blow them away.
3) The Wds is really quick to use. Pull it out, level it up, connect the cables, zone focus and take the shot. Look at it on the screen for focus, shift, etc, correct, take the next shot (rinse, lather, repeat) until I'm done. Afterwards, take an LCC, pack up and go home.
4) I bought the stupid expensive view finder, and use it occasionally, although after I got used to it, I find I use it less and less.
5) It's certianly no heavier than my 5D w/ Battery pack, cable release, L lens, bubble lens, etc. Actually, it is considerably lighter if you throw a few lenses into the mix. (in my case, I travel with my camera, so the pelican case adds a lot of weight, but if I was shooting a DSLR, I'd probably be doing the same thing).
6) I've only had one or two times where I really missed having swings and tilts. It would be nice, but I've managed to build a nice body of work without them.
7) I haven't missed the acrobatics of setting up a view camera then trying to carry it from room to room (interiors) once! Not to even mention the physical area needed around it - sometimes I have to shoot where I don't have that much space.
Well, that's off the top of my head. If I think of anything else I'll post it later. BTW - one thing I really liked about the Arca RMd3 was the ability to take a "plate" camera, add rails and a back standard and have a view camera. Don't know how easy it would be in practice, but it sure looked cool when I saw it at PhotoExpo.
James