I don’t use iCloud too intensively, mostly because I’d have to pay for extra storage and I already got 50GB on Dropbox. But if I were an Apple employee I’d probably use it until the wheels fall off because now Apple is giving all of their employees a free 50GB upgrade for their iCloud strorage accounts.
Before iCloud, Apple gave all employees a free subscription to MobileMe, but they ended that practice last year when iCloud replaced it. iCloud comes with 5GB of storage for free to all iOS users, and an upgrade to 50GB a year costs $100.
Apple employees also get great discounts on Apple hardware, including $500 off Macs and $250 off of iPads.