I think this is a great conversation to be having. Competitive runners as an aggregate are more obsessive compulsive and all in related to other sports.
Running is generally more kind to those that approach it from a moderation stand point. I'm not saying doing less work, but obsessing less about the little things are a key to along career as long as you aren't at the elite level. I saw my teammates in college that made the largest progression by the end of the career were the ones that could turn it off when they weren't in practice and didn't try to think outside of the box too much.
I've often pondered this exact question. When I wasn't running a few months ago, I would have told you I regret the time I spent on the activity. That comes from an overall bitterness where I gave the sport so much of my focus and didn't have the career I hoped for. In high school I had a good time, maybe too much of one, but I let forthcoming training dictate my modus operandi. Had I put 1/4 of that focus into academics I would have ivy league degrees instead of them being from state schools (my 2.2 GPA in core classes wasn't exactly inviting, but my ACT and SAT scores were top 99th percentile.) Hindsight is 20/20 though, and a teenager sometimes lacks perspective. I have invaluable relationships from my college XC teammates. I met my wife at my university. I have a couple conference championship rings I'm very proud of and more then enough newspaper clippings from a small southern town. Whether I'm 100% satisfied or not, running defined the person I am today.
The mistake the competitive runner makes is forgetting that running doesn't owe him/her anything. It also has a very short memory.