The ATR has similar EFIS to the Classic. The overhead panel you will find easier in use. MCP panel is easy. Control pressure on the yoke is about the same. Rudder pressure on single engine about the same. Just as stable to fly. Easier ground school, even though the ATR is a lightyear ahead in technology. Sounds and warnings in the cockpit is similar to Airbus- you will find them nice, compared to 737. The QRH is MUCH better in the ATR. If you are lucky to fly the -500 model, you'll have plenty of power as well. I think you will find the "downgrade" easy and enjoyable! Good luck!
Empati 3000h ATR 7000h B737