Switching fixed<>free on a regular basis

I haven't ridden a free-wheeling bike for over 3 years. I commute, daily, on a fixed.
But I'm planning on doing the 2008 etape so today I'm picking up a shiny new Spesh Roubaix Pro.
Do any of you ride both types on a regular basis? I plan to ride the fixed for commuting and then use the Spesh for weekend training rides etc. I'm concerned though that I'll either:
A) Find a freewheel, geared bike hard going and difficult to use fully
Find myself getting confused and trying to freewheel on my fixed. Or finding myslef unable to freewheel on the Spesh.
But I'm planning on doing the 2008 etape so today I'm picking up a shiny new Spesh Roubaix Pro.
Do any of you ride both types on a regular basis? I plan to ride the fixed for commuting and then use the Spesh for weekend training rides etc. I'm concerned though that I'll either:
A) Find a freewheel, geared bike hard going and difficult to use fully

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At first, the changeover was a bit odd - I'd pedal through sections that really I should be freewheeling for, though I don't think I've ever forgotten to brake. I don't change gear anywhere near as much as I used to, either.
Getting back on the fixed has never been a problem, though. Since the initial learning, I don't think I've ever tried to freewheel it, even after spending two weeks on the mountain bike.
I find it takes no more than 10 mins to adapt when switching to a geared bike - it mainly feels less responsive and sluggish to start with. And no more than 5 mins to adapt to the fixed - once you start pedaling you can feel the pedals begin to carry your feet round and this helps to remember not to stop pedalling!
If I need to carry heay loads, or choose to ride in hilly terrain, then I use the Galaxy. The geometry is almost identical to the fixie. But I don't have much of a problem swapping from one to the other. They just feel different. The odd surprise does happen, though. A couple of weeks ago I was descending on a well-laden Galaxy and had deliberately left it at 48x18, which worked well mixing with light traffic. However, arrival at an unanticipatedly sharp bend did cause a little extra excitement as I realised that leg-braking didn't work :shock:.
IME it takes a perverse excercise like that to suppress the instinct that they're different riding styles.
One lady owner, never raced or hunted.
Only problem I've noticed since I started commuting on the fixed is that, when on the geared, I've become far worse at thinking ahead re changing gear. Consequently keep finding myself setting off from junctions and halfway up hills in a far higher gear than I manage.
Haven't had any problems (yet) remembering that I'm on the fixed when I switch back come monday morning
I did 700km of commuting and training rides on my fixed bike and the first time I rode my geared bike was a 200km Audax. Not a problem.
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