Just to clarify, the main speed cameras are on the Cat & Fiddle (A537) and adjoining roads (A53 Leek & A54 Congleton) and replace the previous every other Sunday Police mobile cameras, afaik :
Snake Pass has a couple of cameras as you leave Glossop.
Woodhead Pass is the main non-motorway trans-Pennine route to Leeds and Sheffield and has never been considered part of any ride-outs I've been on, apart from the hill climb from Holmfirth to Woodhead (A6024) and the cross reservoir and on to Glossop road (B6105).
Winnats Pass is too short and steep to worry about speed limits, doesn't have a reduced speed limit, doesn't have speed cameras and is too narrow for mobile cameras, it is self regulated by tourist coaches, cattle grids, cyclists and sheep.
You are as likely to come across a mobile camera as anywhere else (especially North Wales).
The majority of A-roads have 50mph speed limits, enforcement is more likely along the A515, down Via Gellia (A5012) to Cromford Mill and Matlock Bath, because that's where all the weekend warriors head for.
There are indeed many minor roads of greater interest, including Hope Valley and Mam Tor and all the roads on Clunk's Peak District NVM route added to which Yonderman's Cafe is back open (limited service) https://www.yondermanncafe.com/