Yup. So do I.
I use the interfaces when I need to get multiple streams of audio INTO the machine or if I need fast / precise latency on the way out (a few of mine will do internal monitor mixing so I have no computer based delay while playing instruments)...but 99% of the time? I'm still plugged directly into the headphone port. Its convenient and it isn't plugged 10 feet away in a rack that I have to stand in front of.
I have a feeling most audio professionals still use this more often than not. If they move to bluetooth...there is no fucking way I can deal with the latency even when just doing simple mixes.