Do you think examiners find more enjoyment in reading neatly hand written essays than messy handwriting essays?
And is anyone ever going to write an essay ever again after the exams?
first question: how would you feel if you had to sit there having to decipher what every third word read while knowing that u've a crap load of other essays to get through?
second question: think of those that also take lit 
Hmm, just because you do Lit doesn't mean you'll write essays of your own accord; essays are more for sharing your understanding, merely a means of checking that its actually in your head and also as a test of how well you can articulate yourself. Both relate directly to assessment; hence, I think that these kind of textual essays are only found in school. However, there will be those odd few who will for some unknown reason write essays for themselves - though I've no idea why; see, the ideas are already in their heads, I don't understand how writing it will help them...
However, essays such as lab reports and other vocationally-related documents are of course common and indeed an integral part of their respective professions and will thus be a frequent task.
And no, examiners will not mark you down (at least consciously) for bad handwriting, as long as it is legible.