I am *SO* glad you posted this -- I am in exactly the same boat!! My DS was doing really well on a 3-4 hour EASY routine until last week (with no dream feed but only 1 night waking between 8:30pm and 6am). Last night, he was up every 2 hours (hungry) and it's a struggle to get him to go 3 hours between feedings between the day. Until I read this thread I was beginning to get really frustrated.
We had a bit of a setback a week ago when I got a clogged duct and let him nurse a lot to try to relieve it (he did that night, thankfully) and I was afraid that I had managed to get him back onto cluster feeding. I can't seem to get him to take a long feed now, though (I nurse on both sides in an attempt to get him to feed more... he gets to the hindmilk now, at least). The biggest problem is that I've got a 2 1/2 year old as well so I've got to keep him quiet, lest I have two screaming children at 3am...
Here's hoping our little ones get over their growth spurts quickly!