Using a 50/34 with an 11-34 cassette. I don't mind the gap between gears, but I also don't mind a cadence between 85 - 100 rpm's. What I do like is having the lower gears for hills, fighting wind and when the body starts complaining during a long hard ride.
After attempting my first century 3 years ago and failing miserably, especially on the climbs, I didn't hesitate replacing the 12-25 cassette for a 11-34. Been very happy ever since.