The only reason I'm using a full sized Das instead of a Filco tenkeyless is simply that the latter are harder to find in the US. In my case, my employer only orders office supplies through certain retailers which limits my selection.
I never use the number pad, and wish more manufacturers would offer tenkeyless models.
(This is one reason that Emacs and Vim are incredible editors and tiling window managers absolutely rock. There's basically never a need to touch the mouse unless your stupid window manager has decided to defocus the window.)
Btw, I don't think the mouse is altogether useless, but I tend to regard it as a last resort. If only we could actually mandate UIs which required that all functionality could be accessed via the keyboard (and have it actually work). One can dream...
The Happy Hacking Keyboard Pro (https://elitekeyboards.com/products.php?sub=pfu_keyboards,hh...) is probably the ultimate geek keyboard, and it's a reduced layout mechanical KB.