I agree with the guy with the horns on his head.
Don't get me wrong. I like trail cameras, but I have never had good luck matching up the deer I see on camera with the deer that show up at the stand. Trail cameras are another fun kind of deer porn for me.
Do I believe they disturb deer? I have seen the same deer, day after day after day after day hitting my salt licks-- 70 some events in a week. On the other hand I've seen nice bucks show up once and never again. What makes some deer keep coming and some never show up again? I dunno. Maybe some deer don't like having their picture taken.
As to the the overall effect of coming to the same place to change film/batteries/etc.: I used to think it mattered a lot. However, if you look back on my history of sightings and shooting opportunities and bagged deer, I honestly don't see a huge pattern to it. This goes back to what I've said previously about deer learning to avoid stands. If there are few deer and lots of browse, a single event can make an individual deer or a small herd leave the area. With more deer or thinner browse, 1 of 2 things will happen:
1) The deer you scare off today will be replaced with another deer tomorrow.
2) The deer may be forced to come back anyway, because that is the only good browse around.
One other thing: I used to maintain a salt lick just for the heck of it just behind the local community pool. I mean RIGHT on the other side of the hedge. I've been out on a hot afternoon, sweating, dug a hole put out my rock salt and come back 2 hours later and have the lick ravaged-- all the while kids were playing and splashing and screaming 10 yards away. I have also left my shovel and come back 20 minutes later to find a hoof print in the lick. Although this is not a direct indicator of what a trail cam, or visits to a trail cam can do, I can tell you that deer can learn not to give a tinker's cuss about humans.