Funny, when we did the preferred parking I saw the benefit of how much closer we were. At MK the preferred was right where the AAA Diamond parking used to be and was so close that it would have been a longer walk to go walk to a shuttle than to just walk to the front gate. Did you arrive late in the day? I only ask because it seemed few people were even using the preferred parking when we were there last fall which might explain why those spaces were so much closer to the entrance than regular parking.
This was at the Magic Kingdom, and the regular spots were around 10 rows from us. I admit I have no idea why they were being parked so close to us. Maybe there's a legitimate reason why they were being routed that way. This was around 9am so maybe it was slightly late, but the crowds were huge because it was Easter Week. And you're right, there were only a few rows even filled with preferred parking vehicles, which I also found strange.