As a kid, I had various camp knives, an SAK or two, a couple traditionals, and the occasional cheap lockback from Walmart (I seem to remember an Imperial with a really cheap-feeling molded plastic handle, though I don't know what ever happened to that knife). I grew up in the 90's, and don't ever remember my dad carrying a strictly "traditional" knife. He had a thing for SAKs when I was younger, which then turned into Leathermans later (usually a Micra daily, but he had a couple big ones, too). I remember my grandpa carrying a few traditionals when I was a kid, but being a bit of a handyman and a constant tinkerer, at some point he switched to carrying around a Leatherman Micra as well. (Personally, Leatherman was never something I got into that much, though I do have a few lying around.)
Somewhere around 8th grade, my dad let me buy a Smith & Wesson SWAT knife (large modern liner-lock folder), which I used pretty hard for several years, messing around in the woods and all that. Then in high school, I started going on these annual summer fishing trips up to Minnesota with a friend and his dad. We stayed with his uncle who lived in Glenwood, MN and would fish the lakes around there for about half of each trip, then we'd all go up north and rent a cabin somewhere and fish up there for a few days. Anyways, the first year that we went, my friend's dad had this Benchmade 940 that he was carrying, and I absolutely fell in love with that knife. As soon as we got back home, I went down to AG Russell's (which just happened to be the local knife shop where I grew up in Arkansas) and bought one for myself.
I carried that Benchmade every day for close to 10 years. I bought a couple other knives during that time (some other modern folders, one or two traditionals, a couple Opinels, etc.), but non of them every replaced the 940 in my pocket.
The thing that actually brought me back to traditionals for carry and use (rather than just having a couple sitting in a drawer while I carried and used my Benchmade) was actually knife sharpening. I got tired of taking my knives somewhere and paying someone $3-$5 a piece to sharpen them. (Actually, when I still lived in Arkansas, I didn't mind taking them to AG's shop - they always did a great job - but when we moved out to Arizona about 4 years ago, I never found anyone that I was quite happy with.) So I picked up a couple Arkansas stones to try my hand at sharpening... except I really didn't know what I was doing, and when it came down to it, I was too afraid of screwing it up to take my Benchmade to the stone. So I started digging out knives that I didn't really use, those old camp knives and SAKs from my childhood, a beat up old stockman that was my grandpa's, etc., and started the learning process by sharpening those. Once I got the hang of it, and got those knives good and sharp, I was pretty proud and wanted to use them. So I carried my grandpa's old stockman for a while, and really fell in love with the thing, and I also started carrying and using my Opinels.
From there, I picked up a couple of Case knives and really enjoyed those. Then at some point in the last year, I saw a picture of a TC Barlow and thought, man, I've gotta have one of those! Well, that was easier said than done, but it did introduce me to this place, and to the world of GEC and other traditionals I wasn't aware of before, and now I'm hooked. I got my first GEC at the end of September, and now all the sudden I have 7 of 'em!

(Yeah, I went on a bit of a knife buying streak.) I'm also pretty sure that everyone I know (or at least those I know will appreciate it) will be getting some sort of traditional pocket knife for Christmas. (Unfortunately my dad and grandpa are no longer with us; I would have loved to share this new interest/hobby with them. I know they'd get a kick out these great knives.)