Just starting to look for a turbo trainer myself and wonder if someone could answer a question. Do you have to fiddle about with the rear wheel on them all?
What I mean by that is do you have to change the rear wheel to a spare extra wheel when you use the trainer?
Are there any that you can just clip your bike as-is into and start pedalling?
You don't have to use a different rear wheel. Some people choose to, and some don't. I've always used the bike exactly as it is set up to ride on the road. I've never had a problem with lack of grip or excessive tyre wear, which are the usual reasons given for having a dedicated turbo rear wheel.
As you say - just clip in and start pedalling.
BUT...
If your usual tyres have a pronounced tread pattern, it may be better to get a smooth tyre for the turbo. A patterned tyre may wear more quickly, and will certainly make more noise.