I bought myself a new laptop a few years ago, a very very rare treat for myself. I ended up often waiting for DH to finish on it before I could get near it. I'd feel childish asking him to come off so I could have it back, he'd say "five mins" which would actually be a few hours. It ended as a family laptop with me using it the least.
I got an ipad a few years ago. Nobody but me touches it unless they've asked first. Dd has her own tablet and dh has exclusive use of my laptop now so there's no reason for anyone to be hogging my ipad. He understands now that I love my gadgets and I like to set them up myself, I like to look through the leaflets, I like to put my own stuff on them and organise my stuff the way I like and he leaves my stuff alone. I don't like anyone pissing around and rearranging my stuff or changing my settings. Someone rifling through my phone and ipad, to me, is like someone going in my bag. They are personal to me. Dh has his hobbies and I don't mess with his stuff. He doesn't with mine anymore.
My family joke about me having my phone glued to me and not letting others use it. My brother is worse than me, but apparently that's different because he's a man. I've been called selfish for not handing over my ipad to a random child at a soft play centre and for not letting a family member take my phone on holiday. Sorry but they are precious to me, they took years to save for, and I couldn't relax, I mean one click and they see all my mumsnet moaning about them :)
Individual SD cards sound good, but then that makes it a family camera, so it shouldn't have been gifted as a special present for you, if that's not what it was for. Im prob in minority though.