I believe that the RP shows us the right way to worship, and as such in family worship (for example) we would only sing the Metrical Psalms. My wife, who comes from a different tradition to me, is often humming or singing worship songs from her childhood. Do I try to stop her? No.
However when I am leading family worship we have agreed to worship according to the Regulative Principle, and draw great spiritual blessing from doing so. As Ed says, where else can we get such deep knowledge of the Lord Jesus?
We are part of (and I work for) a church that allows hymnody alongside the Psalms. I do find this difficult at times, and while not making a big thing of it, I remain silent when the hymns are being sung. When I preach in that church, I feel I should follow the pattern that the Minister/Session have agreed, so choose two metrical Psalms alongside two
paraphrases (yes, I know that technically this is not inkeeping with the RP, but it is as close as I can get without making a scene). I know this is far from ideal, but I feel the Lord understands the predicament. When I preach in other churches, I pick exclusively from the Psalms because that it what they are used to - for some reason only RP churches tend to invite me to preach!
If you are opposed to the use of instruments, how do you view instruments in general - i.e. may you enjoy music of any kind, and if you may what happens if this stimulates a response of praise to God (would you deem that sinful)?
As Sam Jer has said, I'm not opposed to instruments in general - it is just in the worship of Almighty God that I have an issue with them. I'm happy to sing along to (suitable) songs outside the sphere of worship. I don't feel this is inconsistent. Sometimes listening to Classic FM (UK-based classical music station) I feel my soul well up with gratitude to God for his providence, and again I don't feel that this is sinful: but I would not choose to worship Him through classical music.
Would be interested to hear how other people approach this.