Hogan... it's all about nostalgia. It's the same as old guys at the pub telling you about how much better football was back in the 1960s. We all know it's bullsh*t, but we indulge them and, even, pay lip service to the good old days. Wrestling is strongly driven by that sense of nostalgia. Since the bulk of its audience is young men, I guess a lot of them when they get older tie certain wrestlers to that good time in their life - hence the reaction guys like Hogan, Piper, and even Honky Tonky Man get all these years later.
As for Goldberg, he has a lot of good features and a lot of bad ones. The way he was booked in WCW, and the way he relied on only a few moves, he was great to watch. There were very few pre-loss Goldberg matches (WCW) that I didn't enjoy. Hell, he even had a good match with Hogan, which I'd never have thought possible. His WWE run was utter sh*t, partly because he's lost a lot of his novelty value, and partly because he was booked weakly, and Vince (in his infinite wisdom) decided he needed more moves.