Never flown Boeing but I do work in Easyjet, where the world's largest transition from Boeing to Airbus fleet is in full swing at the moment.
I've seen it time after time after time, there are plenty of grumpy old buggers with thousands of Boeing hours in this company who initially slag off at the Airbus and basically despise the thing for, ooohhh, at least 6 weeks after their conversion course, while they slowly learn all the tricks and get their heads round the MCDU and the ECAM and the laptop, get accustomed to having tray tables and foot rests instead of some control column, taking your headset off in the cruise, slowly they figure out that the thing has actually got equal or greater levels of safety redundancy than the Boeing, show them a few cool make-your-day-easier tricks with the MCDU, they pretty soon stop their grumbling.
I have yet to find a SINGLE captain who's been on the 'bus for a year or two who would ever want to go back on the Boeing.