I spent the last 2 weeks casually (read: very casually, couple hours every other day or so) getting my level 1 alt through the MSQ and have had no problems with momentum or DF wait time (as a DPS). Currently in Churning Mist, level 53. The trials were probably the fastest to pop. I can see extended wait times if you're playing catch up on patch day, but that's not really the fault of trials and dungeons in MSQ.