I've tried out each and every Lightroom version since the beginning and I never thought about migrating and never really seriously watch any demos, etc. just brushing it off.
Last Friday, I was helping out on a wedding and the primary was doing an SDE slideshow on his laptop with an older version of LR. He was lighting fast. Took about 60 images, processed them and put together a slideshow. It was impressive. We spoke about his workflow and how he also used to use Bridge, import into Photoshop,and save for every single photo, and how LR saves him TONS of time.
So I go download a trial of LR5. Get him on chat, create a catalog, import some wedding photos, and begin culling, editing, etc. Any detailed editing I'll of course do it in Photoshop, but I would say 80-90% of the photos can be processed in LR.
Man...what was I thinking?!? 
I think I'm a convert!
Just wanted to get that off my chest!
LR has saved me hours... if not days in processing. I still use Photo Mechanic for culling, as Lightroom is just a bit too slow building previews. It may be faster on lower resolution monitors, but its not nearly as quick as PM.
