Stop making yourself crazy and just decide you're going to do it.
You never know when the next world-altering event might take place -- the next pandemic, next Russian invasion of a peaceful neighbor, an unwelcome medical diagnosis, closing or shutdown of something you've taken for granted. If something or someplace is on your bucket list, and you can get to it, don't put it off. Yes, "I shall return", you can get to it someday and all that....but "someday" might not come. You're there (more or less), you clearly have enough interest to justify the trip (just look at how much you are agonizing over the question...). YOLO. Go see it (I'm in the "spend the night there to make it worth it" camp, that guarantees a quality experience rather than the grotesque tourist-trap that some posters above have called it).
Last point: Travel is not getting better with the passage of the years -- certainly not travel to popular places. Too many places now are overrun with crowds, require reservations and timed-entry tickets booked months in advance, have been commercialized and monetized to an extent that was hard to imagine just a few years ago. I've been to MSM twice -- first time back in the 1980s, and again in the 21st century. I've been to many of Europe's most popular tourist attractions over the past 35 years. Here's an inconvenient truth: things are not getting better for starry-eyed tourists. With each passing year, it requires more hassles, more hoop-jumping, more tolerance for crowds, more willingness to overlook the crass and seamy aspects of mass tourism. I'm NOT saying it's no longer worthwhile to go see these places, quite the contrary. But back in the day, those of us who were lucky enough to experience now-popular places back when you could just walk up and enter with little or no advance planning or even waiting in a line never realized what the ensuing decades would bring. It's hard to predict the future with any certainty, but I'm pretty sure that at Europe's most iconic, most popular places, visiting them is not going to get any better for you if you wait 5, 10 or 25 years.
You have a chance to see MSM on your upcoming trip. You want to go. Stop torturing yourself about whether "it's worth it" or not. Go, see it. You won't regret it.