How high do you guys normally do a standard round or sheet cake? I feel like a lot of the cakes I do are rather high.

I used to do 2  2-inch rounds stacked, so four layers, but that was usually too much cake for people who ordered, and it was super tall.  So now I will do one 2-in round tortes, and the cake is about 3.5" high, and 4" with buttercream on top.

If there's a baby shower or other special occasion I will make the double rounds for effect.

My double layer cakes when finished are high.   But that's because I top them that way.   I'd rather give the customer a nice tall cake than throw away/eat all the cake tops.   

Yeah, mine are rather high, and serve more than a standard size does. I do the same, two 2 inch layers/

I aim for 4 inches high per tier, as that makes it easier with the SPS system.  No cutting the supports!

AI also try to keep it 4 inches or taller, but I like the aesthetic of a tall cake and it goes with my style of decorating. Because I have limited space in my home I don't have a lot of pans, so I'll sometimes do only 2x2 inch high layers, or sometimes I'll do 3x1.5 inch high. It depends on the pan size and the recipe.

A4-4 1/2"

A5", maybe 4.5" on ab off day.

Interesting...  in the UK cakes tend not to be as tall.

Mine are a minimum of 3" before torting and filling...  so anywhere from 3.25" - 3.5".
 

Mine are 4 1/2 - 5 inches tall.