Soldato
I pretty much always reverse park into bays if possible (ie not the angled ones) because:
1 Its safer coming out
2 It looks nicer
3 I was crap at it preparing for my driving test (15 years ago) and still practicing
The exception being shopping if I can't open the boot, although I've got a lift able rear window so it doesn't always stop me.
At work we have to reverse park into bays (parking policy for company sites) however if I go shopping with the kids in tow it's 99% of the time I have to park nose first as most of the parent/child parking either has a wall or a bollard which would prevent me from opening the boot (estate). It does irritate me somewhat as I then have to reverse out which puts the kids into oncoming first.