Generally speaking, all therapists need to go for therapy if they have unresolved issues or are not self-aware.
That's pretty much every one of us in my book.
Some think that it is possible to be completely objective in therapy, never having to face our own demons. Nonsense.
Agree
Therapy (specially psychodynamic version) can be very frightening experience for the oblivious therapist.
Even if you're not oblivious, but lots of worthwhile things in life are scary or difficult.
As long as one's very effective defensive mechanisms are in place, the depths of fear, rage, despair, unreality and nothingness, are not experienced/worked through. We may experience those states vicariously while dealing with particularly disturbed patients such as those with severe personality disorders, psychosis, or those who have endured severe sexual/physical abuse. Of course we can go for therapy at such a time if a need for it ever arises.
I'd say that depending on what type of work you do and what population you work with, these issues will inevitably arise. In my book, the time to begin working through your "stuff" (we all have it) is BEFORE you hit the rocky countertransference issues with your difficult clients. This is my bias, I realize, but I feel strongly that at least for psychologists who want to do any sort of in-depth therapy with clients, being in your own therapy is just very important. Maybe if you're mainly doing assessment or very brief interventions it's different (although I wonder...)?