I practically live at T5 and even I know that T4 is better. That's not even a question in my opinion. It's much more modern with better food and shopping options than T5. If you're at one of the far gates, they will shuttle you to the other end of the terminal so you don't have to walk. I don't care about lounges so won't comment on that.

On my most recent flight out of T5, just before boarding B6 announced a gate change. I'm talking 5 min before boarding was set to begin after the GAs had been prepping us to board for the last 30 min. I forget the actual numbers but I think we had to move from Gate 8 over to Gate 2 or something like that. If you're familiar with T5 at all, you'll know that those 2 aren't in the same section of the terminal and require a walk to the other end of another part of the terminal. Not only was that a tone deaf move from JetBlue but it was also a hassle for all of us to get over there quickly with small children and luggage and such. I have a medical condition and can't just pick up quickly and run to another part of the terminal while pulling my suitcase with 5 min to spare. I imagine I'm not the only one out of 150 with this issue. And before I get know it all comments in response, there was absolutely nothing wrong with the existing aircraft. They simply decided to re-assign it to another flight and make my flight move gates. I also dread it whenever my flight is going out of Gate 22 or above. It's quite the hike from security when you have carry-on luggage, not to mention there is an uphill incline as well. And once you get into that section of the terminal, there are virtually no food options other than an occasional hot dog cart.