Speedbird,
I’ll let someone qualified in the 777 speak to the specifics, but generally acceleration rates in the large twins will be greater, primarily because their thrust to weight ratios (all engines) are generally higher than 3 or 4 engine aircraft. This due to the fact that certification requires certain performance parameters to be met with an engine out. To have that performance goal met on a twin, by nature the aircraft needs to be (relatively) overpowered with both engines operating.
The feel (g’s) of acceleration should not vary from front to back, but the perception may be different if you are seated behind the (wing mounted) motors. Noise and vibration levels are increased in this case.
Hope this helps