I dont drive these every day but i do work on them, have rebuild most and work on just about every piece of Cat equipment.
We get a bunch of D11Rs but normally work on D8R
The largest wheel loader i have driven is a 992 but again we normally see 988Gs.
Here is a 988F i did a complete rebuild on.
I have worked on and operated 385C excavators, 777 haul trucks and all kinds of fun equipment.
Military 966 loader returning to the US after a hard life overseas.
Military dozers (DEUCE) were fun to drive but a pita to work on.
The most challenging to drive is a scraper. Due to its size, articulation steering, two engines and transmissions and its blind spots. It would be fun out in a field but at the shop its difficult and tricky. Getting it into 8th gear takes some room.