Even before Fast Pass we never waited more than 20 minutes or so. Our first two trips were over Spring Break in March of 1995 and 1996 and we used the Unofficial Guide touring plans religiously. They worked like a charm.
And, now, like I said in my last post, our limit has gone down to 15 minutes posted wait time. We know what order to do everything now, and we ALWAYS get there before park opening and have a good Fast Pass strategy, so we never have any problems.