Incorrect. Amino acids are the building blocks of all proteins, and plant cells are as dependent upon proteins for structure and function - including regulations - as human cells are.
essential amino acids are those amino acids that your body cannot synthesize in sufficient quantities, therefore they must be included in the diet. Non essential is the opposite. EAA's are different...
essential amino acids are those that we cannot produce while non-essential amino acids are those that we can produce by ourselves by nitrogen containing compounds in our body.
The phrase means that they are essential in the diet, because the body cannot produce them internally from other compounds. It should not be interpreted to mean that they are somehow more important...