So far I've not had to use any, and I'm out for work most morning before 6.45am, I'm hoping I won't have to use it too often

But I use road grit, I don't bother paying for the stuff, I just go along to a roadside bin and shovel up a bucketful or two and store it in the back of the van.
It is also really important that you only use a little too!!! And put it down BEFORE you start spraying water about!
I have personally never found it slippery either, might be on something like a marble type surface but in general the chances of slipping as a result of grit on the pavement or patio is really very remote indeed.
Is it messy?
Well yes, it will be if you chuck a bucketful down!! :

You only need a very, very light sprinkling, and only then in area's that might get walked on.
If like me you do a lot of work on shops and offices then freezing water is more of a worry.
Can't see what difference using hot water will make, you might be able to clean windows in colder weather, but by the time it has ran off the windows and reached the ground it is going to be cold and will freeze, certainly won't have chance to evaporate before it does so!
Ian