Tash (or zeTom, as you remind me of him). Me and you seem to be quite alike, in terms of taking time just to reflect.
For me, if a song comes on MTV or whatever, it can bring me back to even maybe just a couple of months ago, when life was slightly different.
I agree, life flashes before your eyes, so make the most of it. But at the same time, in another 20 years, you're going to look back and wish you had been more productive right now.
The Buddhist mentality means that you should just go for it. If you see that girl, ask her out. If you see people in need, give them a hand. We only live once.
Reflecting is great. But make the most of the present.