We used the Fast Lane mid August. The crowds that week were very high. ( compared to when we went in July when the park was at 25% capacity) We arrived at the park 30 minutes before they officially opened. Went through security and scanned our passes. Took pictures at the front and then made our way to the right in direction of Leviathan. They hold you back at one point until the park officially opens. In that area, many people sat where they could, but we went as far to the front so that when we could go in we were near the front of the pack. Fast Lane distribution kiosk was right beside Leviathan. We walked quickly and managed to get there with only a few families in front of us. Had our bands in less than 5 minutes. As we turned to walk away, I saw a line-up as far as the eye can see. Not sure how long that would actually take!
I had the dining and drinks attached to my season pass. For some reason, the scanners at the food kiosks and drink stations could not read the barcode from my phone. Luckily I had a printed copy with me, those worked great. They had different scanners at the front gate, those worked perfectly with my phone.
At the drink stations, they handed out disposable cups without lids. I had brought our refillable cup from LaRonde and poured our drinks into there. So much easier to walk around with.
As for food, I believe ( not 100% sure) that needs to be left in the car. We saw security accept plastic water bottles, but not much else.
Have a great time.