I only use LGW under duress, due to distance not anything else, I hasten to add dear Bealine!!
But a comment on the EWR rapid transit link. Any user of LGW or STN will find it familiar territory. Penn St works well and I used the link twice in March, I can reccomend it highly.
A Memory Moment ... my first flight to the US was VS from LGW to EWR. That was a choice by reccomendation and I have stayed with VS ever since, very pleased when they got into LHR, from where I am happy to take either NYC destination.