This is something I'm thinking about every now and then when my mind starts to wander - if I'd be teleported back to the early 80s, how much of an advantage would I actually have with my current knowledge. Just always knowing which technology will emerge and persist on its own is a huge advantage, paired with knowledge of what trends regarding end users come up when. That alone probably dwarfs any advantage you have in technical knowledge. 8088mph would blow people's minds back then, but being able to do that would probably not be the thing that leads to success, but definitely gives you a shit ton of intern^WBBS street cred. :)
If you could keep your shit under control you'd be so ridiculously OP - I'm not convinced it would actually be that bad :)