I've been posting on here for over 15 years and lurking for a few years before that. I do think the forums have lost a lot of the joy and innocence of the speculation, simple spotting and bashing, and pure enthusiasm, in every sense of the word.
That came with some childish My Lordz stuff, which was not as well segregated into child forums back then, but yes I do think the forums have become a lot more professional and realistic, with more balance between industry and enthusiast posters. Ideas, speculation, any kind of small misunderstanding of rules, numbering, timetabling etc are always quick to be corrected, and/or shot down. Posters are always polite about it, but it's all a bit more po-faced than it used to be.
That said, it's an immense hivemind of experience, knowledge, information and assistance, and on balance, a wonderful and safe space to discuss even the most fanciful of speculative ideas without abuse, and it's very well-moderated to maintain that.
We shouldn't underestimate the value of how, well, polite the forums are!