Correct use of 'majority'

I believe majority is correctly used with a plural noun — "majority of people" or "majority of voters". It's becoming used frequently with a singular noun — "majority of work" or "majority of travel". Is this incorrect use of majority?

You should note that work and travel are mass nouns here; you can't pluralize them. Whether or not it's correct to use majority with a singular mass noun, it's not a new usage: from the OED, there was a similar use in 1882: "The majority of the coral which I collected ... was obtained by divers."

Whether it's acceptable to use majority with a singular count noun is a different question. This may depend on the noun. I personally have no problem with using it for a collective noun, such as "the majority of the audience", but a sentence like "the majority of his farm is planted with cotton" sounds wrong to me.