We have launched and parked truck and trailer at Cap Sante Marina over a dozen and have always had a worry free experience. The sling launch team at Cap Sante have always given our boat great care in launch and taken the time on reloading to get the boat centered perfectly back on the trailer. The launch does use some thick straps which don't always pass through the cutouts on the factory set up trailer bunks. For this reason, we removed the carpet just inside the stern cutout and removed carpet plus about 1/2 inch of the wood bunk from the forward cutout to provide extra room passing the strap through. The front bunk doesn't really carry much weight so the small amount of material removed is not an issue. The guys at the launch really appreciated the extra space on the bunk cutouts. I noticed on their web site for the launch, they call out a required 1.5 inch cutout depth.
Parking is just across the street and we have always been able to get into this lot. They do have another lot a bit further away if the close one is full.
Cost is higher than an in-water boat launch but I love not having the trailer brakes in the water two times each trip. Round trip launch has gone up a bit, now $87 for our R27 (a bit lower for a 25'). I think parking is about $10/day. There may be some lower cost options in Anacortes but we keep going back to Cap Sante Marina for a quick and easy launch. Mid-week we rarely have to wait longer than 15 minutes.