I moved to the DL from a BMW R1100RT.
The RT was some 150 lbs heavier, and seemed lower in terms of center of gravity. But I've also owned BMW K bikes, and a Suzuki DR650. All of those were taller than the DL650.
At any rate, I'm 5'6" with a 29" inseam and I don't have a problem with the DL. I do need to add that I purchased a low-seat, but other than that it was mostly a mental adjustment.
Current rides: 2001 GL1800, 2014 DL650 Adventure; Gone away: 5 BMW's, 4 Honda's, 2 Suzuki's
"The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane." -Marcus Aurelius