I was also long time Nikon user in 2009 I wanted a lighter kit and moved to the just released FF Leica m9. It worked great. But, when Fuji offered a quality system at a much-reduced price point I tested it with the X100T and after a year, I added the XT1. I do landscape, travel, urban and people.
My kit included three primes 14 f2.8, 35 f2 and the 56 f1.2 and two zooms 18-55 and 55-200. For travel, my 3-lens kit is 14, 18-55 and 55-200 plus my X100T, which has a great 23 f2 lens.
I agree about the faster zooms, they are great but don't fit into the lighter kit objective. The 90 lacks OIS. Otherwise, it is an interesting option.
The other lens I have considering is the 60 Macro, it gets good marks, except for speed.
Good luck
Bob