Having been to Dubai many times I can agree with just about everything you said. The first thing that struck me was the amount of luxuary cars. Second would be the amount of cranes, but I'm sure there are less now since they were bailed out by Abu Dhabi. As far as being the safest place I wouldn't agree completely. Well at least not for pedestrians, because on several occasions I have witnessed pedestrians hit by cars.
When I first drove by the Burj Khalifa (tallest tower) I was amazed. I couldn't see the top without sticking my head out of the cab. Going to the highest viewing point was rather boring, but if you time it right and go at night during the fountain show it offers a bit more. The Dubai mall is flat out amazing, and talk about money oozing out of everywhere. I'm not big on shopping, but I couldn't resist when I got in there. The fountain show from ground level was really something you must see (especially at night).
Oh and they do have normal ATM's, but the ones that issue gold are awesome.
You can get to know so much about the world just by visiting Dubai. Why? Because like Rich said a majority of the population is foreign. Just spark up a conversation and you will be amazed at what you will learn about some tiny province in Pakistan. And if you do want to find the slums then you need to travel around the areas the poorer foreigners live.
Best nightlife I seen there was at the Buddha Bar. They put on some great shows, especially the fire show. It's a very nice place, and it's not uncommon to run into famous people there.
It was definitely very clean, and an extremely rich country. It is a business hub, and will likely grow. But it has also experienced financial problems recently, and was really saved by Abu Dhabi.
Rich, was that the most amazing airport you have been in? I've been in some dumps, mid level and nice, but DXB was by far the nicest. However I will add that Sky Harbor here in Phoenix is probably the most efficient airport I have been in. Last place easily belongs to Nepal.