Without quoting a lot, I'll just summerize.
I've actually been fairly unhappy with it for a couple years. I'm a typical Type-A workaholic. The hobby was an awesome outlet when I was living with my parents and didn't have the responsibilities of home ownership and parenthood. I learned, read, and worked on something I love and gained more than I would have if I went to school for it. I'm going to butcher a Good Will Hunting line: I didn't spent hundreds of thousands on an education, I got it for $5 in late fees at the public library.
Now, that's not to say that it isn't still expensive. I absolutely have to monetize it or I'll end up at the end of the season with maxed out credit cards like some of the people I know. Hell NO!
Anyway, the first "bad" year was the year I bought my house. There ended up being tons of projects I had/wanted to get done to suit my needs and everything for the hobby ended up being last minute "I'll sleep when I'm dead" work. I was actually relieved when the season was over. Right after that, work kicked up to 60-70hrs/week + 2hr round trip commuting for 4 months. Then my wife and I found out we were expecting which led to more house work which I wasn't able to complete before the season started. I ran a shortened season and spent the last month before my son's arrival in project "Hair on Fire" mode. While my wife was still off on maternity leave, I insulated the garage. Which led to insulating the house attic, which stretched to a 3-month project as she went back to work and we adjusted our responsibilities. Just finished that a week ago and now it's season prep time (actually behind but I was only planning on running a short season again).
After reading it written out, maybe I just need to not be so Type-A because none of that even includes any of the projects that weren't noteworthy or general maintenance.
Not to be too personal but you might want to have your testosterone and vitamin D levels checked and take some steps to modify your diet and Vit_D supplements. Aging and hormone changes can do all sort of things to "passion."
My own experience is with camping, hiking and canoeing/kayaking. I used to enjoy these activities and did maybe 4-8 short excursions a year in warm weather months. My wife has really gotten into to the point where 3 years ago we camped over 45 days. The packing, setting up, tearing down, unpacking, organizing etc. really burnt me out. I now try to keep these trips down to a reasonable amount and require DW to do all the heavy lifting if she wants to go. We had a wonderful time just sitting on the gravel bar with the kids this weekend and only packing lunch and a few misc. DW often refuses to pack once she found out how much effort I was putting into it so I think we will be back to 3-6 short camp outs a year with maybe a couple of day float trips.
I've thought about getting checked out, but most of my burnout is tackling too many things on my own. I should get a work up just to make sure I'm in good health though.
I can relate to your camping experience. My hobby has a time suck range of 50-300hrs of prep work for every weekend depending on what broke/wore out/needs attention if you want to be in the hunt for the win... and I don't like to lose. It's hard to find people to help once they realize the time commitment.