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In Belgian French you have 'septante' for seventy and 'nonante' for ninety. These are used in Swiss French as well and they might even use 'huitante' for eighty, and i use it too since it makes more sense. Once upon a time there was an 'octante' for eighty too.

We have that in English too, though not often used, as in:
80 = Four score
90 = Four score and ten

I can never get used to the Danish way of counting. It's almost as bad as the French.

[50]
Swedish: femtio (five [times] ten)
Danish: halvtreds (half third [times twenty], where half third = 2.5)

[60]
Swedish: sextio (six [times] ten)
Danish: tres (three [times twenty])

[99]
Swedish: nittionio (nine [times] ten [and] nine)
Danish: ni og halvfems (nine and half fifth [times twenty])

I like the finnish way of counting. It's quite simple, but numbers transcribed to words get scarily long. Some examples:

[1] yksi
[8] kahdeksan
[10] kymmenen
[11] yksitoista
[18] kahdeksantoista

So allright, that looks simple enough, but wait until we get to higher numbers:

[20] kaksokymmentä (not that bad)
[21] kaksokymmentäyksi
[39] neljakymmentäyhdeksan (could be worse)
[1337] yksituhatkolmesatakolmekymmentäseitseman (uuh...)
[31337] kolmekymmentäyksituhattakolmesatakolmekymmentäseitseman (argh)

No wonder the Finns don't talk that much.

I've also learnt French a bit, and thus I will let myself point out, that 99 is even slightly more awesome than what you wrote: because 19 = "dix-neuf" means literally "ten [plus] nine", so finally it goes as:

99 = "four twenty ten nine"

when I think about that from time to time I still get a feeling that someone who created this world must have been joking

The funny thing is when you talk to French people and they think that how they deal with 70+ is normal, and you have trouble explaining to them why it's odd. Many are just so used to it that they don't think about how 70+ follow a different pattern from the rest.