Heathrow is relatively good? News to me. Especially Terminal 5, the official luggage black hole...
I find CDG to be typically french and Frankfurt to be rather silly about security (one check to get into a terminal and another to get into a gate) but at least being Germans they're efficient at it. Trick is to have shoes/boots without metal and a removeable belt buckle so you can just put your bag on the conveyor and walk through. Works in the UK and Germany. Not in France where they made me take every single electrical item out of my bag that contained cameras, laptops, earphones, sundry USB and bluetooth cords, CF cards, etc. Took rather a while and I was running late for my connection.