Like everyone has said already... two different UIs. They each have their preference. It's just a decision that Google made about the UI. Personally, it makes no difference to me either way. As far as a work around, there's none that I know of. One cat. Two different skinning techniques, that's all. Not a big deal. Just get used to it.
Why would you WANT that as a feature tho.
What possible advantage is there to having laggy/fritchiony environment
What possible disadvantages are there? If that is what you are referring to, I can't say that it makes any difference one way or the other, as they both work fine. This is enlightening to know what you are referring to though, because I use an iPhone 3GS every day for work and my Droid personally, and I find the Droid to be quicker usually, especially when overclocked and an overall better experience.
Now that you mention how it does scrolling and moving icons, I can see exactly what you're talking about. Where I notice it mainly is in the contacts screen as I scroll through my contacts. Nonetheless, I am not at all bothered by it, and it isn't something that "feels" sluggish to me, it just feels different.
It is interesting you mention the contacts screen because that is where I feel the least amount of lag/friction. It feels very close to my ipodtouch contacts.