There are many people who either choose not to get GE, or are not able to get GE. In any case as I have freely admitted that it can be good or bad at any Terminal that particular subject really has nothing to do with the debate at hand.
Pbarnette, as we both know the ratio of connecting passengers at LHR is is far greater than JFK, and with that in mind tranferring at T5 is generally terrible and one can go read the forums here at FT for evidence of that.
Regarding the rest, again, "Mark my words"