Oh Dear SKS777, I don't think you are a pilot. All the 777, 757 and 767s you are watching are actually overpowered in order to meet take off safety requirements. An aircraft must be able to continue its take off safely in the event of an engine failure after its go/no go speed (V1). So, if a twin loses a donk, it is on half power, with four engines it has only lost a quarter. It is no wonder, therefore, that the twins seem to leap off the ground like spring chickens! In the cruise, however, all that excess power is an embarrasment as the match between engines and airframe cannot be as precisely matched as with four engines. Have you ever seen a 747 or 707 (KC135) stagger off? No different to a 340 I assure you!