My OH used to take photos of everything, days out, birthdays, christmas, holidays, etc. Way over the top. He once came back from a 2 week holiday with 13 rolls of film, each being 36 pictures (in the days before digital cameras of course) - I brought back 2 rolls and thought that was a lot! Then things got worse when he bought a camcorder and he'd have one eye glued to it during train rides, walking around attractions, videoing shows etc. When DS came along, he basically photographed and video'd absolutely everything! We've got boxed and boxes of photos, tapes etc that no one ever looks at!
Then I think he realised what he was missing by not being "present". There were a couple of times when he was absorbed/obsessed videoing and taking photos, getting himself stressed trying to switch between the camcorder and camera and ending up missing things. Me and DS would talk afterwards about things we'd seen during a show or a tour and OH would have completely missed it because he was videoing or taking a photo of something else - you don't have the same "breadth" of vision if you're concentrating on an eyepiece than looking at the wider picture through your eyes etc. I suggested to him that he go cold turkey and put the camcorder/camera away and just watch things and enjoy the atmosphere/ambience. He took it on board, probably too much the other way and basically stopped taking photos/videos and we started to rely on me taking shots!
Then smart phones came along and I thought he'd embrace the new tech, but he just hasn't, not remotely interested anymore. So it's down to me now, and I'm not that bothered. I'll take a quick shot of something special, like a sunset or a flower, but other than that, nothing. DS has grown up and moved away, so we don't take family photos anymore at all.
The only thing DH takes photos of now are car and DIY projects, where he'll take photos of fixings, or a particular piece of equipment during taking it apart, so he has a visual record of how things fitted together to help him put things back. He's quite a photo library of bits of car engines, insides of fuse boxes/electric showers, coal pattern on our coal effect gas fire, insides of junction boxes, pipework in the boiler cupboard, etc., and loads of photos of when our lunatic neighbour wrote off our car parked outside, showing damage to both cars, location of cars, etc which was vital as the lunatic tried to claim it wasn't her - he was straight out with the camera before she had chance to move her car so his photos showed the damage to each car exactly matching at the impact points - she still tried to claim it wasn't her!
So I think OH is more about photography for practical purposes now rather than memories etc.!