I'm 5'11" and skinny.
I had a 2004 DL650, and now the 2012 version. I've done around 2,000kms on my 2012, I had done 87,500kms on the 2004.
Neither bike needs mirror wideners. I can see perfectly well on either. Way better than any other bike I'd ridden.
2012 seat is better quality foam, it is more comfortable after a long ride.
You can feel the seat is a little higher on the 2012, it makes you feel like your more on the bike rather than in the bike. A little more motard like in feeling. I like it, it's comfortable.
I generally don't ride on the freeway, so I have no issues with the screen or with wanting a bigger screen. The 2012 screen does produce less buffeting.
I don't understand the "foot pegs are too high comment". They are the same footpegs as the old model, they are mounted on the frame in the same way. They are higher off the ground as the new bike is higher in the rear suspension and has more ground clearance. The seat to footpeg distance is very similar between models.
The new handlebars are a different bend. Whether they are much further forward or not probably depends on how the dealer put the bike together and where exactly he set the bars in the triple clamps.
Here is an animated gif I made to show the differences;
The exhaust is shorter, the lights and fairing is smaller and shorter, both centralising the mass. The higher rear suspension has resulted in a slightly steeper rake on the forks. The suspension is setup more sporty.