Personally feel it's essential, and most of the villas we have rented are south facing.
You get the sun virtually all day and we do like to relax around the pool a lot on holidays, Joshua loves playing in the water.
We don't often get much time to sit back and enjoy the sun whilst at home, and Tron mate whilst you only live a few miles away from me as you know we don't get much chance to sit out in 'sunny Lancashire'
(just got back home from Fleetwood by the way, my mum and dad still live there and I take Josh to see them every Sunday).
At the end of the day we prefer a pool that has the sun on it most of the time.
The last villa we rented was advertised as south facing, but actually wasn't and more West, hence no sun on the pool until noon. Whilst naturally we are out a lot of the time it makes sense to me to have the sun there should we want to sit out in it.
I would rather have it than not need it than need it and not have it!
In my opinion therefore south facing is top of the 'must haves'. I know people who booked a North facing pool and had a bad week weather wise, when they wanted a change from the hectic theme parks and sit out in the sun they realised they couldn't see it.
We even ensure we get the full address and postcode before we book, so we can view the villa 'birds eye' style so we can see the pool area.
http://maps.live.com/
A bit over the top I know but we pay the money so want to know what we are getting. You will see many owners advertised as 'south facing' because it is a selling point.
No disrespect intended to any of our DIS villa owners but we have seen villas on websites advertised as 'south facing' when they just aren't.
If you want the shade you just move the sun lounger back a few feet and relax under the lanai area instead, or put a towel over your head!
Providing you sunbathe in moderation/short spells and ensure you have the necessary sun creams you and your children are prefectly safe irrespective of the time of year.
Julie my weather correspondant states confidently North facing = sun in the early morning and evening but a lot of the day will be in shade.
At the end of the day it's an active holiday, we are out a lot of the time anyway enjoying ourselves but if we choose to relax and enjoy some sun it's nice to know it will be out there for us.
Depending on the direction the pool is facing you won't get any sun at all on the pool deck at certain times of the day. West facing at 12noon you have a tiny amount of sun shining on the pool deck, I know because I was laid out it in at the last villa we stayed at, the rest was in shade.
The only way to guarantee catching the 'rays' is getting south facing.