This is a very important point. In the context of the "relocation" of the Holy Days, I think it may be the key point. In today's American society, nothing is valued that is not paid employment. As volunteers (Scout leaders, Sunday School teachers, nursery workers, etc.) we experience a lack of consideration that people would never think of perpetrating at their place of employment.
Would a person fail to inform his boss that he's not going to be able to attend a meeting? Of course not. Will he fail to inform his family that he's not going to arrive home in time for supper, or bedtime? You betcha!
People just don't see attending Mass on a Holy Day of Obligation as an "obligation," because they don't risk a financial penalty by skipping it ... and that is NOT the fault of Vatican 2, at least in my opinion.
(But I did think the "Constitution on the Church in the Modern World" had some goofball stuff in it!)
Keyword = "today". Some of us remember a time in American society when stores, malls, business and many restaurants were closed on Sunday out of respect for its celebration as a holy day.
Money (greed) is the driving force of today's economy. It is so prevalent that we have come to accept and no longer question the necessity to 'open for business' on Sunday. If anything, it takes a certain perspecuity for workers to organize and arrange their weekends so as not to shop on Sunday. Hey .. I did it for many years and occasionally will drop into a store to pick up something I forgot on Saturday. It is a lost discipline to view Sunday as one of rest. Who better than you to use the weekend as a time to accomplish what cannot be done during the week.
As you point out, there is no longer any respect for the workload of other 'volunteers'. Last weekend, Father asked all the able bodied to assist with cleaning the church. Since joining this parish, I have taken those words to heart. What a humbling experience to clean the House of God! But that is my view! As has been the case each time this request went out, 3 of us showed up. Some of the other parishioners point to us to suggest that we don't have a "life" like them with so much responsibility. The words "pesonal sacrifice" never enter their mind. That's okay! I 'feel' called to do this and do it out of love, appreciation and commitment. Last Saturday, I was literally on my knees before the Tabernacle, spray can of Pledge in one hand and dustcloth in the other. It was a moment of conversation between me and my Lord! I expect no gratitude from the parish for this; if anything, I find it embarassing.
There have been many years when I was so involved in the secular life of entertaining family and guests, attending my daughter's Soccer games, swimming matches, or driving her to tennis camp, that I cannot fault those who do not show up. My attitudes have changed with the response to prayer. So now I pray for the others.