What Do All the Orcs Do?

What do all the orcs in the Lord of the Rings movies do when they are not fighting these epic battles against man? Like, I know the orcs and Uruk-Hai that fought in the Battle of Helm's Deep were created especially for that battle by Saruman, but what about the orcs in Mordor? I just watched The Return of the King, and there's that scene towards the end where Aragorn leads everyone out to the Black Gate to distract the Eye from Frodo and Sam, where it looks like literally thousands and thousands of orcs pour out and surround them. Like, there are a ton of them. What do they do the rest of the time? I can't imagine that there were many full on attacks requiring that many orcs. Do they like, take turns guarding the gate and going out on patrol? What do they do the rest of the time? Obviously not much, considering the complete lack of infrastructure inside of Mordor.

Morse Code

Do they still teach morse code in the army? i mean, it seems totally archaic. i can't imagine the average dude in the marines today being taught morse code. yet in every movie where there is some sort of worldwide communication failure, they always resort to morse code. it befuddles me.