T60 user here - just upgraded the CPU to a T7400 C2D, added an SSD and increased the RAM to 4Gb (3.25 or so usable thanks to Libreboot). It's actually still quite usable. I'm currently running Exe GNU/Linux for a modern yet retro look (Trinity DE), and the 4:3 screen and decent keyboard really make it.

More of us than you think (and often by preference rather than cost).

Current main travel laptop is a T420, backed by a T520 w/nvidia when needed (older T41s, T60's lying around). Both work fine with linux & modern browsers (the T420 is particular has great battery life).

I regularly use a significantly older T42. It has a honest-to-gawd parallel port, runs XP nicely and controls a couple of instruments and device programmers. I upgraded the screen at some point (SXGA?) and put a solid-state disk in it. Still going strong.

T430s as a mobile linux workstation for garage projects. For anything else, 14” M series macbook.

Thought I’d put Asahi Linux on it but the workflow I’ve settled on is to use my Mac as a thin client for a linux box under my desk. Best of both worlds.

I still have my T430, but I use my X270 more often now.

I only very recently upgraded from an X230 with X220 keyboard

It was a close call between a totally new machine and a display mod though

[update, 12 hours later: Yep. I seem to be the only one still using a T530.]