I guess that frustration is understandable since you didn't know 7.1 was 64-bit only. Certainly the 64-bit platform offers significant performance increases that couldn't have been obtained if they restricted this to 32-bit. And it's definitely here faster since they didn't need to worry about developing the 7.1 features for 32-bit servers. So those are bonuses. I tend to agree with you that 64-bit "should have" been here in 7.0.
That being said, your migration process should be relatively painless. Obviously it's still early to tell how that might go, and every environment is different, but it's pretty straightforward. Install 7.1, configure using existing database, install the same solution sets, run both servers side by side, upgrade your site servers in batches (if you have them), upgrade your clients (along with your site servers). Nearly everything is stored in the database, and the Migration Wizard covers a lot of what isn't in the database.
Licenses for the Altiris products must be saved or re-downloaded from licensing.symantec.com and then re-entered into SIM after installation on the 7.1 platform. The only other thing to watch out for is that if you modified default policies (not exactly best practice) instead of cloning them, the policies are reset to their default settings again. That's because it turns off Upgrade policies for you and things like that. You can avoid any pain (such as losing changes made to default monitor pack policies) by cloning them ahead of the upgrade.
In fact, avoid a lot of pain and read through the entire guide. That goes for everyone.