I don't see it turning us into a bad parent. And I definitely agree that there should be no physical act involved in it or that could be easily deemed as abuse or violence. With anger, stupid expressions could come out from our mouths candidly; and if you add humour to your angry words, then the kids will not feel too hurt. Example: "I'll throw you out of the window." They know that this is IMPOSSIBLE to happen to them. Here's my advice. :)
I had many times expressed this kind of anger moments to my girls when they were 12 and 15 respectively; the tough ages to deal with of growing up. This age bracket is the period when they demonstrate to become really stubborn, air-headed, make up lies, slamming of bedroom doors, turning off their cellphones when mom or dad is calling, become lazy with chores, being pushy and demanding, breaking curfew hours, and would almost hit you back if you threaten to hurt them. I can totally see myself the way I had acted during my teens.
But never, never put a hand on them. Talk to your children one-on-one, heart-to-heart behind closed doors. Be a good listener and politely persist to let them listen to you as well. Throw in a short story of your childhood as an example, so they can see themselves in that pattern (this usually worked between me and pa during my time). If you get them to pour out and/or find both of you in tears, then you will know that you have successfully touched your kid's heart and mind.
Explain your ways of discipline that it is only out of LOVE and ask your kid if he/she can agree to that. Refrain from leaving the room unless the situation has been settled. End your private conversation with each other's exchange of acceptance and apologies; tight hugs and kisses. Be fair. Close the deal with the big words: "I LOVE YOU."
P.S. I received all the types of discipline when I was a kid, and had molded me to become a better person and mother to my kids. Sorry. It's a long reply. Hope it has given some sense to your question. Cheers!