Well, there's a lot I can say about this! I just viewed liturgical churches as dry and even counter to the Christian faith. The Bible does not command vestments and that whole "churchly" style, and I thought it was "religious" or "man-man", "void of the Holy Spirit." To me, the liturgical churches were nothing short of pagan, pharisaical, and demonic. But that could not be further from the truth, because the liturgy consists mainly of direct Bible passages or strong allusions to it — it's the literal words of the Holy Spirit, so it's anything but void of God's Word.
Essentially, I was wrapped up in conjuring up good feelings in myself and others, and I confused the Spirit with hype. I was very concerned about working on our church's (Hillsong London and later Fellowship Church) branding (I was doing graphic design/production for the church). I thought Sundays were for me serving in a team and being ecstatic, and I had a very narrow and confused understanding of what worship means. But then I came to realise the riches of God's Word, and that Sunday is primarily God serving us, and not us serving God. Our Lord speaks to us through His Word, and He gives us the free gift of Christ's body and blood, for our comfort. And in relation to this, we get to confess our sins, receive forgiveness, and offer up thanksgiving. And the liturgy leads us through all of this with the reverence it deserves, whereas before, the only liturgy I knew was really just a few watered-down pop-rock hymns, some motivational speech, encouragement to tithe, and an altar call, with Jesus' name sprinkled on top. There was just no substance, and I always learnt more about the pastor's personal life than I did about Jesus and what He means to us. No one explained to me what God's Word is, or what Baptism is, or what the Eucharist is. There was no catechesis, and no clear teaching; only vague ideas on how to overcome problems, succeed in life, become a better person, or how to aspire to be a leader. But God's Word, and a liturgy done right, is much richer than that.
Now, I still remember my strong feelings against the liturgy, and I have friends and family in charismatic, Pentecostal, and non-denominational churches, so I can understand the feeling. But I would encourage them to take a closer look at the liturgy and see just how rich it is in God's Word and how it moves us through repentance, confession, forgiveness, and thanksgiving, and that there is room for joy and peace, and also mourning, and everything tied together with reverence.