With the greatest of respect its a lot more useful than that.
The experience gained is vital IMO, not just for Europe but also for high profile matches at home. You learn new things every time you play in Europe. Our intertoto run in 2004 got our players so much experience which really stood to us the following years in the League, UEFA and CL.
One one very small example of things you pick up on various trips;
You mentioned the trouble Linfield had in the heat in Cyprus earlier in the thread. We played in the Lithuania in extreme heat. We won 2-0 but our players suffered badly. We learned our lesson. The following year in Cyprus we have fans with us in the dressing rooms, salt tablets, change of jersey for every player which were kept in ice boxes etc etc.