There are times when I wonder if all that's really required is a good honest heart toward other people (hard work, love, caring for others, etc.) - and all this ordinance / sacrifice / priesthood holding, moving, etc. is the invention of men. Blessed by God, but only one of a number of paths that are acceptable to Him.
A good scriptural account of this principle is how the Lord worked with the brother of Jared. The important thing was that a journey needed to happen - to get the people to the promised land.
The boats were just tools in the journey. How the boats would work, or have light to support life, could be done a number of ways.
The Lord lets the brother of Jared choose one way (crystal stones touched and lighted by God's power), and God reaches His finger through the veil to oblige and bless that choice.
That is one way you can get to the promised land. Obviously, other groups did it differently, and the Lord blessed their "ways" also. In the end, it was the journey and what the individuals learned along the journey that mattered, not the details.
I think this way about the Temple Ceremony, and possible sources Joseph Smith might have used to create it. If it was blessed by the Lord, than that is fine for me. As [someone else] put it:I'm chalking it up to human ideas.
I think in many cases . . . they're pretty good [or even transcendent] ideas and can help me feel close to God, as long as I don't get so caught up in the literal teachings that I fail to benefit from the symbolic and spiritual truths and principles they are meant to convey. The details are far less important than how I use them to reach my intended destination.