I believe that flying is a passion for many people who aren't actively engaged in the practice at any given time. I know that sounds weird to some people around here, but I do believe it's true.
I see myself as a great example of this phenomenon. I caught the aviation bug when I was very young, and my dad would take me out to airshows on a yearly basis near our home. He never flew general aviation, and no one else I knew did so when I was growing up. But, he'd take me to the shows and I'd enjoy the hell out of them. I always watched planes, always wanted the window seat when flying on family vacations, and always chatted up the pilots of the airliners we'd be flying on when I was a kid (oh, who am I kidding, I still do it now as an adult).
In college I began working on my ratings, almost on a whim. I quickly discovered that such training wasn't really cheap on a student's budget. My private pilot certificate was fun and exciting, and I'll never forget that first solo. I found my instrument rating to be a bit boring and monotonous (I like a view), though I'm glad I got the training. But, I was a broke college student by the time I finished that rating, and couldn't really afford to do all of the recreational flying I had dreamed of after I got rated. Flying ultimately got put on the back burner while I started to build a life for myself. I've always been frugal, and I've always felt that it's important to plan for the future. Really, I guess that's what I did for the past 13 years or so since I finished college. Got a job, worked a job. Upgraded jobs, worked there, too. Got a house, paid for a house. Found a woman, married a woman, got divorced (oops), found another one, marrying that one soon enough. Life moved along, but it just sort of got in the way of flying for a while. that definitely didn't mean I wasn't thinking of airplanes along the way. Honestly, I've had my study materials from my ratings on my living room bookshelf ever since I started flying!
I ended up getting the chance to get back in the air through work a few years ago (LE helicopter crew). The requirement we had in my agency was that you had to have some sort of pilot certificate (any type), at which point they'd bring you up to speed as a tactical flight officer on the Bell 407 that we fly. I did that for a couple of years, and loved the hell out of it. Doing that really introduced me to some of the joy that can be found in flying low-in-slow. But, career advancement ultimately forced me in a different direction yet again.
All of that aside, the truth is that I don't think I've heard a plane fly over in 15 years that I haven't looked up to watch. I still read on aviation topics, watch every video I can find, and dream of flights that I plan to take eventually. I joined this forum around the time I decided that I need to get back into aviation on my own terms (outside of strictly training or working). If I can convince my wife-to-be that this is a great thing to do with our time and money, I think I'll be in good shape. We aren't rich, but we can probably afford to fly at this stage in our lives. The tough sell is that she has personally known six people who have died in 3 or 4 different general aviation accidents… not a great start to the hobby! Nevertheless, she enjoyed a flight I took her on in my department's helicopter, and she is the adventurous type even though she downplays that idea (former barrel racer, climbs mountains with me, etc).
Aviation is a bug that sticks around once it bites, even if it ends up on the back burner for a while. I'm hoping to buy my own plane within the next couple of years, but I need to get the better half flying with me in rentals a few times first! An inactive pilot friend of mine who is also thinking of getting back into aviation was recently asking me what kind of plane I would buy if I got one. I told him I'd buy the wife whatever plane she wanted!