Back in my rambling in post #16 I talked a bit about photography applications of alkalines.
As I said, even relatively primitive DSLRs like the Fujis I mentioned, or using an AA tray in a Nikon D200, gives totally unsatisfactory results and an uncomfortably short life.
Add in live view now, a feature that was primitive on the Fujis and non-existent on the Nikon, and you zap the batteries even more. Imagine that on MILCs with their EVFs too.
Even back late in the film era, cameras were "smart" enough that many photographers were switching to NiMHs. The Nikon F100, which was THE prosumer/second line pro camera of the late 90s/early 2000s(and fell enough in the internet age that you can find a lot of contemporary information and reviews on it) will last 10-15 rolls on AAs. If you're a "2 Christmases on 1 roll" photographer, that's not a big deal, but you also don't need an F100. If you're a 20 roll a day shooter, which was high but not exactly uncommon back in those days, that kills your batteries fast(and shooting that much also meant that a D1 would pay for itself really fast). My F6 is used somewhere between those extremes(if I take it on a trip, I might shoot 3-6 rolls) and I squeeze 20 out of a pair of lithium CR123As, but primarily because I use manual rewind(power rewind can suck up a half roll's worth of power every time it's used, and I'm rarely using film in a situation where I don't have time to crank it by hand).
Someone else mentioned that even using AA-sized rechargeables in photography applications has benefits. Lower internal resistance is a big deal. To use an example I know off the top of my head, the AE Motor Drive FN for the Canon New F-1 could be used with an 8 cell AA pack or the "High Power Ni-Cd Pack FN" that also contained 8 AA-sized cells(I've rebuilt a bunch of the latter with both Ni-Cd and NiMH cells). 8 fresh alkaline cells are actually more like 12.8V, although that will quickly drop to 12. 8 fully charged Ni-Cds are 9.2V. Still, though, the camera can run 4.5fps with the alkaline pack and 5fps with the Ni-Cd pack, plus the Ni-Cd pack shaves 2s off the rewind time(7s vs. 5s).
Strobes are the single most common thing using AA form factor batteries, and if you're stuck 10 years in the past like I am, it doesn't take too long to kick an SB-800 into thermal shut-down with moderately heavy use using NiMHs with the 5th cell holder. The batteries will be dead long before that happens if you're using AAs as it just doesn't recycle fast enough. That's also why, back in pre-history, event photographers would walk around with SLA batteries strapped to their belts feeding their Vivitar 283s or whatever, and killing a few in the process.