I think gamers have gotten better.
When I was young, computer games where something completely new that I had no experience in playing. It took me over a year to get through Mega Man for GameBoy. If I pick up a Mega Man game for GameBoy or NES now that I haven't played, I usually complete them in 6-8 hours.
Yes, I think games have gotten easier - and to a large degree because of frequent/constant saving - but gamers are also getting better, and with this, content that was harder earlier becomes easier now.