It’s unusual to hear Lutherans refer to their services as either “high church” or “low church.” More formally educated (i.e. pastors, seminary profs, etc.) will, but usually you will hear it referred to as “contemporary” or “conservative” among the average Lutheran. Note that “high church/low church” and “contemporary/conservative” aren’t really synonomous when talking about worship, but that’s more likely how you will hear it discussed.
There are some “high church” congregations out there. They still have a formal processional with a crucifix, they still have kneelers on their pews (and use them!), they still make the sign of the cross, the pastor still chants much of the liturgy, he still wears the formal vestments, etc. You will hear a formal, historical liturgy, similar to, and in some parts the same as, a Catholic liturgy; as Preus points out still using the Kyrie, Gloria, Nunc Dimittis, etc. The accompaniment is often a beautiful pipe organ. This type of worship is in the minority among Lutherans today (unfortuantely!), but it’s out there. It would be on the far right of the spectrum. It’s being done at the congregation level, not at the synodical level (governing body level).
On the far left, you’ll see worship services accompanied by rock bands, barely recognizeable forms of liturgy, pastors in just a sport coat (polo shirt in the summer), arms waving in the air, “creeds” that the pastor writes himself as a substitute for the Apostles’ or Nicene, etc. This seems to still be in the minority, also, but growing in popularity. This would definitely fall in the “low-church” side.
The majority of Lutheran congregations are in the middle, still using the printed liturgies in the hymnals, but setting aside the more formal things like the sign of the cross, processionals, etc.
As a Lutheran for 38 years, I’ve seen both ends of the spectrum and those in the middle. My preference is definitely the “high-church” end, but there aren’t that many congregations left on the far right end of the spectrum.