Do not take the easyBus into town. Probably the worst and least efficient airport shuttle in Western Europe. If this wasn't Europe, they would probably call this company a scam.
I actually liked the north terminal. Everything was great in my experience. Really fast shuttle train between terminals. The Thameslink train is a nice compromise between the Express and the bus.
Queues for "other passports" arrivals are just awful unless you managed to run in with prefilled landing card. 40 mins in, barely walked the half of it.
Gatwick Airport is the eighth busiest airport in Europe and until March 2017 had the world's busiest single-use runway, with a max. of 55 aircraft movements per hour. It serves more than 200 destinations (more than any other UK airport) in 90 countries for more than 46 million passengers per year.