Have to be honest, personally I find his "guidelines" to be a bit on the high side myself, and I'm one that will tend to tip some people on top of the base fee that gets collected.

As someone that prefers any time dining, I often don't tip waiters, letting the auto-tip cover it. (The exception is when I've had the same waiters on a number of nights for a cruise, and felt they did an excellent job. I've had ones that I've had on a number of nights that I thought did an ok job that I didn't tip extra for, so it's not an automatic for me.)

Cabin stewards will almost always get an extra tip from me (but at the end of the cruise, I don't bribe up front). I honestly don't think I've ever had a bad steward so far.

I've only once had a bartender that I felt like tipping extra for.

Probably more important even than tipping, if you feel someone does well by you, fill out a compliment card for them. These cards are very much used in helping to judge promotions for crew members (and for that matter, can be a factor in even deciding if a crew member's contract gets renewed).