I agree that Lion is much faster than Snow Leopard, but REMOVING features aiding productivity and ergonomics is not acceptable (I know I will get bashed by people telling me I should move to Windows and so on).
I am a definite power-user. I use my computer almost exclusively to build software (Java, C/C++ and Objective C) and to run my business, hence, I use my Mac on average 12 hours every day. Being a developer and a business owner, I usually have at the very least 10-15 windows open at any time, having to physically push down the Trackpad is a killer from an ergonomic point of view. I don't even see the reason why they would remove it. The spaces thing I can live with, but the Trackpad thing is a reason enough for me to be very suspicious about the promised delightfulness of Lion.