grammar.adverbs.quantity
Quantity adverbs: muy, mucho, poco, bastante, demasiado
Muy + adjective/adverb (muy caro); mucho after verbs (trabaja mucho). As adjectives, mucho/poco/demasiado agree: muchas cosas.
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Explanation
Quantity adverbs say how much. The key contrast is muy vs mucho: muy modifies adjectives and adverbs (muy caro, muy rápido, muy bien), while mucho modifies verbs (trabaja mucho, llueve mucho) and can stand alone as an answer (¿te gusta?, mucho). You can never say *muy mucho; the intensified form is muchísimo.
When these words come before a noun, they're really adjectives and must agree in gender and number: mucho trabajo, muchas cosas, poca gente, pocas opciones, demasiada burocracia.
Other useful members: bastante ('quite / enough', invariable as an adverb), demasiado ('too much'), apenas ('barely'), casi ('almost'), and tan ('so', before adjectives/adverbs, tan caro). Bastante and demasiado also agree when they precede a noun: bastantes problemas, demasiados autos.
Examples
The procedure is very slow and costs a lot.
Region: global
There's too much bureaucracy.
Region: global
The procedure is very slow and there are too many people, but it's moving along quite a bit.