Keyboard key switch mechanism has surprising effect on you. It changes your typing habit. Here's a simple story.
On social networks {g+, Google Reader, Twitter, Facebook}, you can press {j, k} keys to go down/up by post. It's nice, but for some reason i just don't like using it. (i was using Microsoft Natural 4000 and Microsoft Natural. Both use rubber dome keys.)
now, i'm on Truly Ergonomic Keyboard, it has mechanical keys, and i find that i started to use {j, k} keys for post navigation.
(note: i'm using Dvorak Keyboard Layout, so the {j, k} i'm discussing above is actually at the {c, v} positions of normal QWERTY keyboard.)
the ease of pressing the keys made a difference.
I have used mechanical switch keyboards before. Earliest is 1991, IBM Model M keyboard that came with IBM PS/2. Used it for half a year. My second one is “Matias Tactile” amazon, around 2002. Really nice. I realized the quality in keys just by touch and look, without being familiar with the phrase “mechanical keyboard”. Only after 2008 i joined team keyboard freaks.