Computers are evil! Don't use them!!! You brain will become awash with useless data like average speed, distance travled, time on the bike, current speed!!! All these will ad to your unsatisfaction with your performance, and you will start to judge yourself by numbers!!! And when you judge yourself by numbers you cant win! And you will suffer, and you will become obsessed with beating the numbers, and the concept of an "easy" ride will no longer have meaning, and no easy rides lead to exhaustion, and exhaustion leads to more suffering and you will fade and burn out. Your hate for the bike will conquer your love for the bike, and when hate wins, the road ahead leads to doom.....Like becoming a golfer...
Just as you can condition yourself to know the time of day without a watch, or to wake up at a certain time, or to remember your dreams ~ you can become intuitive about your cycling, more connected to your bike...as if you were riding a horse you knew well?