I'm in the same situation as you all. I thought we were alone, so this is reassuring!
DD maybe has said 10 words total but each lasted a week and haven't been back since. Right now she doesn't have any. I, too, am waiting for the "word explosion" everyone talks about.
We had her 18 month appt already and the doctor said to keep an eye on it. If she still isn't speaking much in a couple months she said to come in and we'll talk with a speech therapist. She isn't too concerned yet (especially since DD understands us so well), but doesn't want us to wait until the 2 year appt if there is still a problem.
I hope all of our LO's start talking soon!