I picked up an Experimental Lens Kit for my Oly ELP2

[Major Nikon]

3. There are situations where zone focusing is actually far more effective than autofocus

For certain lenses I much prefer manual focus to autofocus lenses. The reason is because manual focus lenses are designed to focus manually (duh) which you might not think about, but you give up a few things on autofocus lenses when it comes to handling in manual focus operation. Autofocus lenses tend to have a short throw between the minimum focusing distance and infinity which makes precise manual focusing harder. They also don't have the same feel because you have the autofocus drive to contend with. You also usually don't get a DoF scale on the lens itself. With certain lenses I am almost never in autofocus mode, so to get a feature I never or rarely use, I've given up a lot in the handling department. Ultrawide and macro lenses are two examples I would never buy an autofocus lens for, unless other characteristics far outweigh what I'm losing.