We've done DIY n the last 10 trips and wouldn't go any ther way, having looked at the alternatives I'm positive it's cheaper (and IMO better) than a package
We usually use companies like villarentals.com and typically get a lovely 4-5 bed villa for around £1000 for 2.5 weeks ver the summer.
We're VERY picky so take a long while choosing the villa as want something close, with a water view and preferable south, SW or W facing so we get the sun on the pool in the afternoon (very picky!). We typically end up about 15 mins from main gate, sometimes closer. We've never booked a villa 'package' as like to know the specific villa were staying in.
Its all about personal preferences but I personally love the fact we have our 'own' house to chill out at after the parks, and certainly find the local restaurants cheaper and usually better than most hotels.