I do go through most drive through but some are tight. Traction in general is no worse than SRW. Wet grass is not an issue. Extremely deep snow SRW may be better however in most snow DRW has been fine with 4 x 4.
The rear hips are as wide as the mirrors so overall its not much harder to drive than a SRW.
When it comes to parking length is a bigger issue than width. I can get my DRW into any parking space that a SRW fit into.
I drive my dually everyday without issue. No it is not a great vehicle to drive downtown and find a parking space but neither is a crew cab SRW.
The additional stability while towing makes up for any perceived shortcomings when not towing. I have owned dually about 5 years and the only real dis advantage I have experienced is needing to buy 2 additional tires.
Maneuvering,parking,traction,MPG's are non issues and are really no different vs.a SRW long bed crew cab.