Most of lines have only the odd attended crossing (roughly Waterford 2, Cork 4, Limerick 3) while I think Sligo, WRC, Tralee are now fully automated. With funding issues conversion to automatic has almost stopped, many 1-2 a year now where it would of been much higher towards end of 2000's. One person per shift been able to control each route's crossings is a big saving.
Yes Waterford/Rosslare had the same problem and it's difficult to balance service improvements and costs.
Most people go to Limerick J, Kilenny or Waterford to take the train from South Tipp, it would probably make no difference if they routed towards Limerick J or Waterford in terms of journey times.