Blueprints are a toy. Which serious Unity dev would use UE4 without C#/F# or UnrealScript!?

Umm I used simple windows script to lay out the whole plan of my game because the game is vast… but I doubt blueprints can handle the whole truckload, I think it can handle only certain engine features like switching 1st person to third camera view, ect, bars, and status huds, ect… are these blueprints even optimized for C++? what I’m likely to get from blueprints if I only use just blueprints is slow or choppy frames from the engine if I use too many of them…