The Boardwalk is fun at night. There will be jugglers and magicians, sometimes there is a movie on the village green and carnival games (bring cash, they don't accepts MB's or cc's). If you like ice cream, I would recommend going to Ample Hills for some dessert. You can see some of the Illuminations fireworks from the bridge between BWI and EP, but not the entire show. Using Disney transport, your best bet is bus to DHS and walking or taking the boat to BWI. It would be faster to uber/lyft/Minnie Van. IMHO, it's worth a visit if you are staying at an EP resort or visiting EP or DHS for the day and want to check it out one evening. I don't know if I would make a special trip over from a MK resort. I don't know where you are staying, but when we are at an MK resort, we sometimes like to visit Ft. W for the evening - go to the stables, Chip and Dale sing-a-long, play on the playground, etc.