It hides from the developer that you are actually doing something that could be costly.
For example, that innocent "item.price" could actually be calling an stored procedure that makes all kind of querys to get the right price for the current session customer.
In Java, item.getPrice() would be a hint to this fact. In C#, someone could abuse the property, in different instances of the same item, unaware that he should cache the value to avoid performance hit.
Of course, there are ways to prevent this, but are mostly related to procedures the developers must follow.
Actually, while I really like C#, LINQ, and Visual Studio on the whole (I'm quite happy developing with it), I'm starting to understand why Java had some things that forced the programmer to be explicit about what his/her code did. Not forcing you to catch or throw exceptions means, for example, that methods that couldn't throw an exception (according to it's definition) actually throw them. And you didn't put a try catch because it was a simple call and there were no methods that could throw...