"IN the Northeast" (USA obviously)...the practice...is rare". It is also rare in TEC in the same region where the Lord's Prayer is a part of Rites I and II Eucharistic prayer. At most I see a few doing the "orans" position of spread arms. The "frozen chosen" heritage is tough to break.

 As to our Christian brethren in the evangelical churches, hand holding would be present but is far from universal. It tends to depend on the age and class of the congregation. The more interesting question is whether the Lord's prayer would be recited or more likely sung to a slightly twangy slightly country influenced tune by a "praise" band. Swaying might also occur, as worshipers sang along. It is likely the only fixed prayer used as it is obviously scriptural and doesn't violate their anathema on repetitive prayer or fixed liturgy.