That is, Europeans tend to choose time over 
money, while Americans pick 
money over time.  If you take it a step further, Europeans prefer time, 
and Americans prefer "things" (yes, I know in some cases people are saving the 
money, so it's "security" or "time in the future" versus "time now"... but in a lot of cases, really, it's "things").  Obviously these sorts of choices fit into a much larger cultural context, both as far as the relative value of time versus 
money/"things" as well as how taking time off is viewed in the workplace.
The organization 
Take Back Your Time is making a valiant attempt to affect this greater cultural context as much as it can.  They have a Take Back Your Time Day coming up on October 24th-- nine weeks before the end of the year, because Europeans work the equivalent of nine weeks (360 hours) less a year than Americans on average, between more paid time off 
and less overtime-- 
and I will surely write more about it as the time approaches.  But I encourage you to check out 
 the website in the meantime!
As for me, I never let a 
vacation day go to waste, but I also don't always pick time over 
money.  This is a little complicated, but...  I get 15 
vacation days and 9 comp 
days (which function the same as 
vacation, really).  I roll over the maximum of 10 
days vacation every year (I used all 9 comp 
days my first year but none of my then-10 
vacation days-- mostly because I wasn't eligible to during my first six months, which included the summer-- 
and have maintained those in reserve ever since), but I've used my full allotment of 10 
vacation days in year two, 
and am on pace to use all 15 in year three.  I'm also able to cash out up to 3 unused comp 
days at the end of each year, 
and I try to do so, but I also make sure to use at least 6 comp 
days so I don't leave anything on the table.
There are definitely times I'm tempted not to take 
vacation because there's too much to do.  It's usually hectic 
and stressful catching up when I get back, 
and sometimes I feel bad about important work being delayed when I'm not there to do it. But taking time off makes me happy, whether it's for a long 
vacation, an extended weekend, or just a single day off when I really need it.  I like spending time with people I care about, visiting interesting places 
and doing interesting things, 
and having time that's obligation-free.  
And I think in the long run it's good for my performance at work, too; when I've gone too long without a 
vacation, my focus 
and concentration wanders 
and my stress levels increase, 
and I'm just not at my best.
How much 
vacation time do you get?  Do you use all of it?  How do you feel about that?