I cannot speak for ALL priests. When I was ordained, I celebrated versus populum each and every day and really didn’t think anything of it. However, after some time celebrating mass ad orientem in the Novus Ordo and the Extraordinary Form of the Latin Rite, I prefer celebrating mass ad orientem. It is easier for me to pray the mass when celebrating ad orientem. But, no. It doesn’t feel weird facing the congregation because that is what I grew up with and what I was trained in.
When we are speaking to someone, we face them. It seems odd and foreign to our normal posture to speak to someone while facing others. The orientation of the priest versus populum or ad orientem has repercussions in how we view what we are doing.