Same. I expect to get 4+ years out of my current, for my usage. In hindsight, I should have just stuck it out with my late 08 mbp and skipped the ones in between. I've had desktops all the while for crunchy stuff. My old 15" was slooow when I sold it, but was in excellent condition and still more than adequate for light usage.
For what I use it for, my new 15"/512gb/16gb/750m, is pretty overpowered tbh, but I was always getting a 512gb ssd, and 16gb ram so it'll really last. Meaning £100 more for a faster cpu and dGPU, it'd be silly not too.