I couldn’t agree more. The constant repetition of fillers such as ‘like’ or ‘you know’ can make otherwise incredibly bright people sound incredibly lame. I’ve had seemingly well-qualified job applicants sprinkle enough ‘likes’ and ‘kindas’ throughout the interview that you’d think they were making a commission on it. This doesn’t inspire a whole lot of confidence in their broader communication skills.
I’m far from perfect in this regard myself, but I do try to be cognizant about overusing filler words. Plenty of stupid things slip out of my mouth as it is, so I hardly need to be fueling the fire by, like, always saying ‘like’, you know?