As someone who carried around a D7000 and 16-85 for a long time I would say it is not really that much easier to carry then say a D800 and 24-85 or 24-120. It certainly gains some weight and bulk - but it is only about a 220-280g savings.
If one is looking for portability I would say a DSLR is not your solution. Look to micro 4/3rds or a Fuji X-Trans based interchangeable lens system (or Sony Nex). Now your are talking about saving major weight and shedding major bulk.