Advertising: I don't get useful ads by default. The more ads I block (unconditionally, not attempting to filter by my preferences) on Twitter, the more useful they seem to become.
Photography: I don't like looking at other people's photos as much as I used to. Mobile phone cameras do all kinds of weird and unpleasant processing, and usually have focal lengths that result in bad looking portraits (they're usually no more than half as wide as the human eye's focal length.)
Arts, culture, and nightlife: It's harder than ever to find places where people aren't periodically checking their phones. I enjoy having random and serendipitous encounters, and phones and other mobile technology get in the way of that. I'm fortunate enough to live in an area where some bars and clubs outright ban cellphone usage, but it's one step forward, two steps back.
I can think of a lot of other things, but I think those three are enough grievances for a single post.