Hi Wolfgang,
The one easy thing about Sketchup is the access and ease of use. In order to be a power user, you need to scale up and develop systems that allows for prototyping and preparing models for use with Sketchup and other software. There are many plug-ins out there that can do the job for you, but a power user needs to understand what he or she needs in order to put into use.
Let me know if this answers your question.