Another reason the credits are much longer is that older studio pictures only used studio employees. Their contracts did not stipulate that they receive screen credit.
For example... you are not giong to see every grip and gaffer listed for Casablanca but you are for LOTR:ROTK.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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