There's been some major changes in the last ten years to the layout Harry and it's blatantly untrue to suggest that almost everyone who uses it dislikes it.
The building of T5, the revamped T4 and the removal of the old T2 all saw to that. The move away from constrained cul de sacs to open plan toastrack layout deserves credit also. Be fair, it's only in the "wrong place" btw if you're wealthy enough to live in parts of West London.
Heathrow is becoming a new airport, once T1 is gone, that only leaves T3 to fix. The rest of it is pretty much fit for purpose.