FYI, TrueCrypt and BitLocker are not the same thing. If you do have a TPM chip, then BitLocker will be superior. If you don't, there are still things that BitLocker does that TrueCrypt can't.. plus there was a recent exploit against TrueCrypt that made it ridiculously easy to hack.
Slashdot IT Story | Bootkit Bypasses TrueCrypt Encryption
BitLocker, for instance, allows key escrow. So your employees laptops can be secured, but you don't have to lose everything if the employee quits or is fired. TrueCrypt can't do that.
Many people want or need domains, even in the home. A buddy of mine has his family with 7 computers hooked up in a domain to make it easy to give access to those that should have it, etc..
VNC and the like are also not anywhere near as good as Remote Desktop. RDP shows virtually no lag, while VNC becomes virtually useless in a high latency environment. Also, RDP does a lot of things VNC doesn't.. including seamless mode, multiple monitors, and with Windows 7, you can even do 3D acceleration through RDP (including Aero).
Virtual XP mode isn't just a virtual machine either. Apart from the fact that you get a free license for XP with Ultimate (so you don't need to buy one if you don't already have one), it provides a seamless mode where you can put an icon for an app on your desktop and run that app just by clicking on the icon. Can't do that with VMWare.
Ultimate also has other advantages, like Windows Subsystem for Unix applications.
Now, maybe none of this stuff matters to you, and that's fine.. Ultimate isn't for you. But don't tell people that these things are useless, and you don't need or want it... Some of us do both need and want those features.