There have been countless prayers to Saints and Jesus' mother posted over the years with Catholics praying NOT for intercession but directly TO these people for salvation, peace, help, health, selling houses, miracles...Many of these prayers come from former popes, and many publications with the Nihil Obstat declaration...
And YET, you guys deny praying TO these Saints and Mary...
And praying TO these entities without the purpose of intercession IS worship...
That said, the words "Pray for us" are usually part of the prayer; and when they are not explicit, they are nevertheless understood. Nobody thinks that the saints in heaven act as independent agents, dispensing favors by their own power or piety, apart from Christ Our Lord.
Notice HERE (Link), the the classic Litany of the Saints, the difference between how the Saints are addressed, and how Our Lord is addressed.
The Lord is asked to have mercy on us and save us.
And you'll notice (tagline) the angels, too, intercede, by offering our prayers to God.