Ideally with the reset curve tweaked to the minimum (for max combustion efficiency) the circulation pumps (and burner) will run nearly continously, with VERY steady room temps. Yes, this DOES use more electricity- there's a trade off, but in most systems the significantly higher combustion efficiency more than makes up for the extra power use from an operating cost point of view.
From a comfort point of view there's no comparison- running constant room temps means the temperature of the walls are never super-cold, making it less comfortable even after the setback recovery ramp has brought the room-air up to temp. You can usually be as comfortable at a couple degrees lower temp using outdoor reset than when using a deep setback strategy.
Some reset controls have a programmable "boost" function for faster recovery time to be able to take advantage of setbacks, while still maintaining a low reset curve.