We have a large canvas in our living room that is printed to look like a photo collage, it has 60 or so photos. It's from Black Sheep Design and I love it, will likely get a new one in a year or so. We also do an annual display for lost loved ones in this room which includes several photos on display - they aren't up right now, but the space remains cleared for them.
Up the stairs on the wall, we have previous collages, two smaller ones - one put together by a photography studio and one I think I put together on photobox or something and framed, and another large Black Sheep Design one.
We also have some framed on the landing. We're getting some multiframes that will go there soon with photos of extended family and my spouse when he was little from my late-MIL's home. I don't have photos on display elsewhere in the house.
We also have an old photo album with the few childhood photos I have - I've no desire to display them or see them regularly for many of the reasons jellyelly said and more, but they're pretty much all I have left of me as a child and I get it out time to time to show the kids, so it remains in its hiding place. We have quite a few albums of our own photos (which reminds me, I need to finish the chatbook for 2018) so we can look at them up close and has quite a few that aren't on the walls. Along with art, world map, and other things on the wall and some in storage that needs reframed and drawings my kids have blue tacked all over.
I've never heard the mantra of 'walls are for art and that photos of people should be in frames rested on surfaces'. Personally, like both my meticulous grandparents and my hoardy grandparents, I enjoy having my wall and hall of photos. Bit of cheer and fun and - having memory loss issues - I've found the recommendation to view them regularly which I can do more easily on the walls has helped. Most of the surfaces are used officially or unofficially in many ways that I find photos there tend to get hidden behind things (may have gotten more tendencies from the hoarding side than the meticulous side
).