Came across this thread and was frustrated to learn that, indeed their is no built in way to copy/paste an effects stack to multiple clips, but I discovered a method that is nearly as quick and painless, so I thought I'd share until Adobe fixes this ridiculous problem.
To the left in the 'Effects Rack' there is an option to save the effects stack as an Effects Preset. You can save the stack with some temporary name, select your other clip, scroll thru the pull down to your temporary name and choose it as a preset. BOOM, pasted. Then you can delete that temporary name if you life for tidiness the way your mother would want things.
Hope this helps in the meantime.
Loving the Adobe to Audition workflow, but there are definitely little things you bump against sometimes that just makes you go, "are you serious?"