Not to turn this into a 'what's better' thread, as the whole batch vs fly sparging thing seems to be a religious subject with most people. One thing to keep in mind that your method and its effectiveness is very very dependent on your equipment.
But I've tried both. For me and my equipment and method, batch sparging didn't give me worse or less efficiency than fly sparging, and batch sparging actually took *longer* for me. By the time I drained the first runnings as quickly as I could, added in the additional water, stirred it up, and did a vorlauf until it was reasonably clear again, it took longer than my typical fly sparge. Maybe I'm a bit too picky on how clear the wort should be by the time I transfer to the boil kettle, but that's my experience.
Now, the last batch I did, fly sparging, I was trying to use a perfect amount of lautering water, and when the mash tun was completely drained, I still needed another gallon in the boil kettle (10 gallon batch.) So I decided why not, I'll give it a try, I'll add in a couple more gallons, and if it takes a half an hour to drain because of the set grain bed, oh well, I'll live. However, I added in the additional water, and was able to drain it off quite quickly.
So, I'm considering doing another batch sparging attempt, but *not* mixing up the grain bed. I'm not sure how much this is going to hurt my efficiency as compared to fly sparging, but I guess I'll find out