I'd say just the opposite. Indeed, in the UK it's normal for the signs leading up to a roundabout to include an overhead map view, since that's often the easiest way to understand what you need to do to get where you want to.
Then I started paying attention to the displayed layout. This helped me with the bearings and lane positioning. At least, that's one item off my list when I'm in the roundabout.
The map/diagram helps people not familar, the only really complicated thing is making sure you get in the right lane, and keeping an eye on those around you.