What keyboard are you using? If you have a good, ergonomic desk (required prerequisite), then try the Matias Ergo Pro. It is the most comfortable keyboard I've ever typed on, and I've owned literally dozens of mechanical, ergonomic, split, and specialty keyboards. Just be aware that the build quality is terrible. I had two Matias keyboards, neither lasted a year... And I type lightly, preferring 35 gram keys. At $250 each it is quite the investment. But, honestly, they are worth the price. They are _that_ comfortable.

Yes, I am a heavy VIM and bash user. I'm sure that some days I do not touch the mouse at all.