Oh yes, I remember X-Files being SO popular that they had X-Files conventions! You never hear of any conventions simply for just ONE show. The only other show that I know of to have its very own convention was TOS in 1n 1972 (the very first Star Trek convention).
The conventions were very rare at the time, in America. I'd gone to a few in the late-80s that were solely for Doctor Who, and even then one of those had Trek as well (1991, where I'd met Nichelle Nichols

and she would surely not say a single syllable to a single audience member asking and prodding and begging for the scoop for the then-upcoming film), but as more BBC sci-fi was aired, there were some small but stable audiences and those conventions expanded. But these were still few and, apart from DW, Trek, and X-Files, conventions themselves were fledgling and only ramping it up by the mid-90s. It's not like sports where every week everyone goes to a stadium to punt their favorite shows...
But, yeah, Trek in the early-90s easily held its own with such a huge fanbase. It was a different time. I've never made it out to many conventions since then, sadly...
I'm glad we got Picard season 3. It was basically season 8 of TNG to me. Seeing the Enterprise-D live again was such a great gift to TNG fans IMO.
Same here. The time and effort to recreate the "D"'s bridge set design, with actual display technology, was really great. (I pretend that the 6500K accent lights weren't available until Wednesday, hence their using 3000K for the all-beige look. The net effect on screen still carries the right tone and doesn't detract, which is amazing given how massively iconic the 1987-94 set was.)
It found a balance for appealing to long-established fans while trying to open up "our crew" to fans of just the PIC spinoff as well as casual channel-flippers. What really impressed me was how it retroactively gave the TNG feature films a gravitas and reverence, for lack of better word, that simply did not exist for them at the time - partially because many movies from the 90s all had a certain whimsy that... wasn't my thing. But the nonchalant destruction of the "D", which looked cool but still lacked the dramatic power of TSFS's coda for the original/refit Enterprise, was given a loving tribute and innovative recreation where a lot of thought was put into it - thought that gave it more depth than its destruction had. Ditto for Kirk's body, all boiling down to following up on the Prime Directive and in a very satisfying way. Ditto for the Borg returning, though I miss their original look the most as those did look the most cybernetic and creepy. I don't remember all the references, but I recall all 4 had some mention and in a thoughtful way. Even in reviewing, it's not all "memberberries" and despite noticing how they were reusing the tone/feel of TWOK for the opening of season 3, it still works in its own merits. There's a fine line and like fine wine, this one aces it. Yeah, they redo the AGT poker ending, but it doesn't detract from how the 1994 finale felt.
PIC/3 was definitely what TNG needed to give the only other Trek crew to reach the mass public zeitgeist the reverence they deserve.