Frankly, I take it less as being about some "golden era" and more about what people prefer content to be made from. I mean, when you get down to it, a lot of the arguments from the Marvel staff who spearheaded and/or support the OMD retcon/status quo and fans who want the marriage brought back boil down to what's the best status quo for carrying the series forward, which fits what came before better, mixed in with a little personal preference.
Long story short, I'm not sure it's so much about marriage fans wanting the comics to go back to a better era, but just wanting more material based on the version of the character they prefer and the professionals keeping the retcon in check since that's what they want to write about.
Way I see it, the people (professionals and fans) who disagree and argue over the retcon have a different fixed point where the characters "solidified" into their evergreen status, e.g. the younger adult with on-again-off-again relationships with a few different girlfriends or the only sightly-older adult who did get married and is navigating life with his partner. (Probably doesn't help that Spider-Man is iconic as both a teen superhero and an adult one, so there's already not exactly a single, universal set up for the character that transcends the franchise as a whole.
The professionals will have to speak for themselves, but I kinda get the impression that many of them see Peter and MJ being an on-again-off-again dating couple as the "valid" version of their relationship, not them being in a committed marriage (consider statements from professionals that the couple dating is allowed, but not marrying, and that them as a married couple is a great "what if...?" premise but cannot be "canon" to keep the character "on brand.")