Using AWS can be as simple as spinning up a instance on EC2, this is pretty easy to figure out and get going. The problem with AWS is also its power, it is so configurable that spinning up an instance on EC2 will have 30-50 configurable options - I think that can be overwhelming for some. Adobe does have some ColdFusion AMI's on the marketplace that have hourly licensing, so you should be able to use features like auto-scaling with those instances, but if you are bringing your own license key then everything Dave said about that would apply. Your best bet is to give it a try, you can do so for free in the free tier or even just spinning up a server for a day to play around can be very cheap. I use AWS all the time for setting up temporary servers to test stuff. You may find that it is too complex for your needs, or you might just love it.
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