There are some gung-ho Zen students who disparage therapy and think that going to a therapist is a weakness. I used to be intimidated by such people but now I feel quite ready to take them on, as I watch them one by one falling into their own karmic traps. It's easy to find numerous Zen students—and teachers—who have ongoing unresolved psychological issues. And that can make us doubt what we're doing.
My teacher, Zen Master Seung Sahn, said once, “If your direction is clear, then you can use any technique to help your practice.” I've personally found psychoanalytic therapy helpful in clarifying karmic issues that weren't being addressed by my Zen practice. And having a therapist who isn't a Buddhist has forced me to bring my practice to the marketplace. I can't just repeat dharmic clichés and expect them to be taken as truth.
Without therapy, my practice was stuck. But I couldn't have survived the rigors of therapy without my practice. On the other hand, therapy by itself could never have given me the direction for my life that I got from my teacher.