As a CFI, I don't like touch-and-goes because they tend to reinforce bad
habits. Specifically, during a touch-and-go, you need to retract flaps
before you add power. This is TERRIBLE reinforcement for go-around
procedures. I have often done BFRs for pilots who learned using T&G's, and
when asked to go around they almost always retract flaps before adding
power. This is very bad. My home field is relatively short, too, so I don't
do T&G's with my students.

When at a longer runway, I might do T&G's if my student just needs a lot of
landing practice, but in those cases, *I* always retract the flaps on the
ground, so that for go around, the student won't have the tendency to reach
for them.