I'm a fan - they really open up possibilities. I've been working on an urban photography project: buildings, traffic and narrow roads made framing awkward, so I needed a zoom lens; and things of interest were often above head height, so I wanted a shift lens.
My solution? I unveil possibly the world's most unwieldy lens: the Mamiya–Nikon 55–110mm shift zoom! This combination weighs 2.5 kg (5.5 lb), and needs a tripod - it's so heavy my hands shake!
As to the rising cost of lenses, I'm fine with that. Apart from anything else, it's nice knowing that old lenses are being used rather than languishing forgotten and unloved. Anyway, the prices for most lenses may have risen but aren't exactly astronomical.
Mamiya 645 Sekor 55–110mm + Kipon shift adapter + Nikon D800E: