Finnish has the pronouncation very closely related to the spelling.
Oh my God!!

So, do you actually pronounce ALL these letters? Basically, I find all these extremely big words in any language ridiculously difficult because I make an assumption that may be not correct.
Basically, I am assuming that there is ONLY ONE stress on only one of the syllabes of the word (which is what happens in Greek). So, the biggest greek word that comes to mind at the moment is otorinolaryngolog
ía, which is pronounced with one and only aspiration and only one stress.
If this is not true for the big words of your languages, then they are not really so difficult... you just make them difficult by writing all this words without spaces. For example, if I had to put a stress on each of the words that make otorinolaryngología, den it would become "óto ríno láryngo logía" (óta=ears, rínos=nose,lárynx, logos=the speech, to speak about something, the science that speaks about something), and I would not write it as a simple word...