Man, everything that comes to mind falls squarely in the "Good for me but not for thee" category.
I love OnX, but can't stand seeing so many new people in what were previously very remote, very hard-earned hunting spots that I know they wouldn't have sussed out without it. Side-by-sides, same thing - allowing people to get way out, way faster, into those same spots, instead of what I first had to do in a heavy, slow old truck. Range finders? Wouldn't be without mine, but I despise the fact they're allowing people to think they can take shots they're just not capable of making due to other factors. And let's not mention guys with guns - who needs guns? Be a better hunter and stick it with an atlatl.
I can't think of any piece of equipment I wish wasn't invented...for me. It's all the other people who shouldn't have it, right?