i've never understood what all the fuss is about.
you're going on holiday
passport, credit cards, tickets and money sorted first.
count number of days away and take socks/pants/shirts accordingly. i fold shirts round carrier bags to keep some sort of crease(tip picked up from this site), and they do for dirty washing.
shorts and swimwear-2 pairs of each.towel to lie on on sunbed, toiletries and books.mp3 player.flipflops(if last years still wearable)and trainers/shoes depending on what i wear to travel in.
job done. total time spent -10 miutes maximum.
if i'm going somewhere i will need a coat/fleece i wear it to go, or don't take one.
i try to avoid having both hand luggage and hold luggage. only need mp3 and book on plane.
if i go for long weekend with only hand luggage, i dispense with most of the toiletries(as most hotels i stay in provide them, and it makes it easier at security), and just buy suntan lotion etc locally.
so again, what is the problem