Context is a beautiful thing
Eph 5 is dealing with living holy as God is holy. Live a life of love, submit to one another, etc. Don't be evil, don't be filled with wine, but instead be filled with the Spirit. This can't be referring to the baptism of the HS for two reasons:
1) This is a command. I don't think anyone can tell the HS what to do. "Spirit, FILL ME NOW!"
2) The general context is about lifetsyle. Thus, being filled with the Spirit has to do with the way we live our lives.
Now, verse 19 and following tell us what it means to be filled with the Spirit:
- Speak to one another with psalms, hymns and spiritual songs. Sing and make music in your heart to the Lord, 20always giving thanks to God the Father for everything, in the name of our Lord Jesus Christ.
Now, the NIV makes this a new sentance, but it is a continuation in the Greek. It should more accurately be rendered "speaking . . ., singing . . . always giving thanks." See, for example the NASB's rendering.
K is right about the word "filled." It means to be made full of, or completed, or something along those lines. In other words, don't be filled with the sinful lifestyle, but be filled with the Spirit. Wine is a great illustration, because when you are "filled" with wine you do less than moral things, usually. You are under its control, figuratively. Same idea here . . . live in the Spirit so much that you are under His control on a daily basis, singing, giving thanks, praising, submitting to one another, etc.
God bless