DWC has never been crowded in my experiences there. Immigration will be extremely quick and there is no traffic in the area. You will be really close to Emirates road as well - the traffic there never reaches Sheikh Zayed road levels until you reach Mirdiff City Center.
For ground transportation to Dubai and around, taxis are easily available - not too sure if you plan on taking a taxi to the hotel; that might prove to be a bit complicated.
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