First of all unused plugins will drain system resources even though they are not enabled. This might not be true for the Sonic Foundry track optimized FX's, the SF guys can let you know for sure on this one. The best solution as of V2.0 is to make 1 track and then edit it and remove all plugins, then just right click on the track and do a "duplicate track".
What I usually do is create multiple Vegas projects that have a preferred setup of where I like to start from, and I just open that project. This way I have all my most common plugins and buss routings and track faders and inputs all ready to go when I start, then I just need to hit record or add media from explorer.
Ive been begging for a template for FOREVER ...Especially one with input routing remembered as this is a pain to set up everytime, but I dont think SF understands the need :(