I think the holiday entitlement is fantastic. I work part-time (only 4 hours a day) and I'm entitled to 28 days of holiday a year! It does take some getting used to--not having to beg for a day off for a doctor's appointment or whatever, especially when compared to my previous job (teaching), where I practically had to present a death certificate to get a day off (or even a half day).
Overtime is also nice. While I'm not paid for overtime, I get to save up the time and take it whenver I want. I don't have to submit any forms or give three weeks' notice...it's weird to just say, "Hey, I'm gonna take Thursday off", to my co-workers and they're like "Okay. See you Friday." I guess that's a perk of working for a small organisation--much less red tape and bureaucratic crap!