The skepticism is not unwarranted. Borrowing your exercise example, it would be like saying you do X pushups every day and it changed your life, and then saying you've been doing that for a couple days.
Wikis are infamous for not working out on the long term.
I have 10 years experience of editing wikis. I just never thought to start one for myself until two days ago.
If there's something so fundamentally different about running a wiki for yourself on localhost vs a collaboration like Wikipedia or UESP, then why not put some skin into the game and make that point? That sounds like an interesting topic.
I don't even understand the "skepticism". MediaWiki is one of the ubiquitously used platforms in the world via Wikipedia. Nothing about my post hinges on you taking my word, the point was that it will take you a few minutes to get it running yourself, so just try it.
Sure, maybe I came off a little strong by saying that it changed my life. But I have enough life experience to realize when I've encountered something big for me. And being able to organize some of my "lost causes" in a couple days has already made an impact on my daily workflow in a massive way, like for the first time in my life, I feel like I have a grip on my digital existence. I could go into more detail if anyone actually cared the same way I could tell you how moving to Mexico City changed my life after just two days.
Maybe you would walk away from that convo saying that my bar is too low to be using that phrase. Fair enough. But logging into a throwaway to trash it with adolescent glee is a practice in the least charitable interpretation, not someone who wants to have an honest conversation. "Um, there's no way that Mexico City changed your life in just two days" just seems like a nonstarter to me, and rather combative.
If you're skeptical, why not ask how it supposedly changed my life, and we go from there? I glossed over the details of that in my post because, well, that wasn't the point of my post. I just kinda reject this modern attack-dog culture on the internet where you supposedly have to couch everything you say in a front-loaded defense lest someone finds a way to attack you for it instead of probing for more info on it before reaching their conclusion, especially when it's a negative one.
My MediaWiki folder is almost 100gb large and I've been putting a lot of work into regaining control of everything I've built, digitally, in 10 or more years. Yes, it has already changed my life. Though this thread is already far too derailed with walls of text to have that convo here, I think.
Just try it and make your own decision. That was my point from the very first post.