I have been a few times recently (all at the weekend) and the queues are basically non-existant. The worst it'll get is first thing in the morning when the uplift opens, because everyone jumps straight on, then from there on everyone kinda spreads out.
When I say "worst" I don't think we ever queued for more than about 5 minutes. Most of the time you walk into the queue section and get straight to the end before you can even catch your breath for your last run. The uplift vans run constantly and they just opened a new quicker route up the hill to allow them to run even faster. Honestly, queuing just isn't a thing at BPW in my experience.
The uplift isn't at the bottom of the hill though, it's slightly up the hill, so you do have to pedal a bit back up to the uplift. It's not far, but my unfit body was knackered from the downhills, so was pretty ruined by the time I got in the queue. Having 5 minutes to cool down before loading your bike was a blessing, not a curse and gives you a brief moment to chat to your riding buddies.
I have an ebike and a manual and personally wouldn't take the ebike here. It's more fun on a lighter bike and easier to lift the bike onto the uplift trailer. Also, the runs can absolutely batter you, so probably not ideal for the components of an ebike. That said, many do take them and it would probably be nice to have the power to get back to the uplift.
Definitely get an uplift pass though. I wouldn't want to ride back up. You'll get far more runs in with un uplift pass and enjoy the day more.
Have fun!