Sub HideBlahs()
Dim col As Range
For Each col In ActiveSheet.UsedRange.Columns
If Application.CountIf(col, "blah") > 0 Then
col.EntireColumn.Hidden = True
End If
Next col
End Sub
FYI your posted code reduces to:
Range("E1,M1,AC1,AT1,BD1,BR1").EntireColumn.Hidden = Not productver_2dot5.Value