Did it again this morning, it does change how you ride, pulling from junctions can be interesting, no zipping out with flailing pedals but I would imagine that gets easier as you get stronger.
Its one less thing to think about, I can quite easily block the "Must change gear" mental process.
Hills are tackled differently, build up as much momentum as possible and then batter it, no dropping down into lower and lower gears, focuses the mind.
I tend to try and preserve momentum, even more than normal as it was so hard won.
I spend more time out of the saddle, this rarely happens when using the gears, too easy to drop a cog and spin away, stuck in one gear its a choice of put more effort in ot stall
Not going to get all Zen and mystical about it, its just riding a geared bike in too high a gear, riding a Singlespeed I would imagine has its benefits but I doubt its some religous experience, still, might get one.
Now, about these fixed geared things....