I treat my citibike membership like how the vast majority of Americans treat their gym membership: pay an annual fee and use it only a handful of times throughout the year. I've had my membership for 6 months and have only used it 6 times. They're definitely convenient for short trips as they remove (some of) the hassle of owning a bike, though trying to find/redock a bike during rush hour is a hassle in and of itself. I only find it useful for cross-town trips and would never attempt to ride over any of the bridges with it.