I have two ways that I deal with this. In one case I have a file called "xyz agenda template" and each time I need to make an xyz agenda, I use the template. If my standard agenda changes over time, I change the template.
The other situation is for standard next actions in GTD. In this case I use a macro that inserts a bunch of specific NAs into my GTD system. An example for trips would be:
Invite wife (if it's somewhere nice)
Decide on travel times
Contact travel agent
Submit Travel request
Register for meeting (if reqd)
Submit for reimbursment
Hope that helps...