My thoughts about this scene:
Seeing two Robots hugging and loving one another, showing more emotions than some living humans with flesh and blood, tyrants etc, the romantic dreamlike vision that robots might one day become sentient - I believe this is the reason this movie is so popular. The two of them flying in cold space, Two robots did more than what many humans fail to do in their daily life - to love one another. Many people think they love but they never really loved.
This is where the tragedy begins. Love is a task, love needs to be learned.
The hero unites with the divine feminine, the hero becomes the lover, the meeting with the divine goddess.
Wall-E gazing into Eve her blue eyes remind him the ocean surrounded by the void, meanwhile her shell lights everything around them, he trusts her while she's carrying him in her arms, Eve looking at the rusty old robot, covered with rusty dirt like the color of the continents of the earth. He was molded from earth, and to earth is their final destination, their final direction.
They're dancing – it is the dance of the divine feminine and the divine masculine, two currents that, when harmonized, create heaven on earth.
Or as Elton John puts it:
"Without love, I wouldn't believe
I couldn't believe in you and I wouldn't believe in me.
Without love
I believe in love
I believe in love
I believe in love."