Thank you for posing the question.
Eph. 3:14-15 tells us we are all one family ("Catholic") in heaven and on earth, united together, as children of the Father, through Jesus Christ. Our brothers and sisters who have gone to heaven before us are not a different family. We are one and the same family. This is why, in the Apostles Creed, we profess a belief in the "communion of saints." There cannot be a "communion" if there is no union. Loving beings, whether on earth or in heaven, are concerned for other beings, and this concern is reflected spiritually through prayers for one another.
If you read the prayers posted at your link, you will notice that they are intecessory - "please pray for us", "please intercede for us" - etc. Asking the saints to pray for us is no different from you asking a coworker, neighbor or friend to pray for you. In Rev. 5:8, the prayers of the saints (on heaven and earth) are presented to God by the angels and saints in heaven. This shows that the saints intercede on our behalf before God, and it also demonstrates that our prayers on earth are united with their prayers in heaven.
If your prayers to the saints are intercessory, and basically asking the saints to ask God because they are not mediators in the same way Jesus is mediator for us, why not pray directly to Jesus? After all, 1 Timothy 2:5 says: “For there is one God and one mediator between God and men, the man Christ Jesus....”
Why aren’t all of your prayers directed to whom the Bible says is our one perfect mediator, Christ? He’s God, he won’t be overwhelmed or annoyed at all your prayers.