1. New potion will be significantly worse than Old War, but not terrible (per use ~1,5 Million damage by the new potion vs. 2,5+ million for Old War).
2. There are significant downtimes using DB, even with the legendary ring (I got it). You have about 33 APM with DB, which puts the idle time at about 15-25 seconds for a 1 minute window (depending on ahste Levels and Meta-use). For me, that is nearly unbearable, but unfortunately the DPS difference compared to Prepared gets too big with better gear for me to justify playing Prepared at the moment.
Well, it is
at least 1/3 of the time waiting for something to press. So your feeling is not that far off