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Matthew 22:37-40 King James Version (KJV)
37 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
38 This is the first and great commandment.
39 And the second is like unto it, Thou shalt love thy neighbour as thyself.
40 On these two commandments hang all the law and the prophets.
I believe it is self explanatory that from the second commandment, we are to love ourselves and others as well. Therefore, I believe this is a very locked-tight argument that all people matter, not just God.
This answer may not directly answer your actual question, because Reformist Theology may not assume God only matters, so the question may incorrect in its assumptions. However, it does speak to the matter of whether only God matters.