I believe Gate 2 is only used in certain circumstances, or as essentially a 'holding point' for some passengers.
T1 is a real mess - you can clock up a few miles going from the T2B pier to the Irish arrivals area. Perhaps a 10-15 minute walk at a brisk pace! Perhaps not far off half a mile. I'd hate transiting from an El Al or UA/NZ flight onto a flight bound for Ireland!