As anyone who is a seed starter in trays knows: seeing those little green bumps as the plants start to sprout is a magic moment. It shows you got it right. Not too much water. Just enough warmth. Etc. And the seeds responded. A very magical moment.
And peas are one of the more difficult ones to grow in trays. The seeds rot easily. So it takes some practice and experience to get them to grow consistently. At least that has been my experience.