It's everywhere. St. Ignatius Brianachovsky gives at least 20 examples of the toll houses in the liturgy I don't remember the list exactly but for instances tollhouses in liturgy, the canon for the departure of the soul in the Great Book of Needs. Prayers in the Octoechos for Friday vespers tone 2. The prayer of st. Eustratius prescribed for the Saturday Midnight Office. It's not only in liturgy, it's in synaxaria, patristic homilies, many saints in the philokalia, scriptural commentaries (for instance, see St. Theophylact commentaries on St. Luke), the teachings of modern saints like St Theophan the Recluse and St. John of Shanghai and San Francisco.
Here are just a few examples:
Because the prisoner too is then most grieved, when they are leading him out to the court; then most trembles, when he is near the judgment-seat, when he must give his account. For the same kind of reason most persons may be then heard relating horrors, and fearful visions, the sight whereof they that are departing may not endure, but often shake their very bed with much vehemence, and gaze fearfully on the bystanders, the soul urging itself inwards, unwilling to be torn away from the body, and not enduring the sight of the coming angels. Since if human beings that are awful strike terror into us beholding them; when we see angels threatening, and stern powers, among our visitors; what shall we not suffer, the soul being forced from the body, and dragged away, and bewailing much, all in vain? - St. John Chrysostom Homily LIII on Matthew
"Then we will require many prayers, many helpers, many good deeds, and a great protection from the angels on the journey through the spaces of the air. If when traveling in a foreign land or a strange city we are in need of a guide, how much more necessary for us are guides and helpers to guide us past the invisible dignities and powers and world rulers of this air who are called persecutors, publicans, and tax-collectors by Holy Scripture." St. John Chrysostom
Homily on Patience and Gratitude
One day, at the beginning of the ninth hour, when the venerable one (Anthony), began to pray before taking food, he was suddenly taken up in the Spirit and carried by the angels to the heights. The aerial demons tried to prevent his ascent; the angels who argued with them demanded that they state their reasons for preventing Anthony, for he had no sins. The demons tried to expose sins he had committed from his very birth, but the angels shut the mouths of the slanderers, telling them that they should not enumerate his sins committed since his birth, which have already been blotted out by Christ’s grace. But let them present the sins—if there are any—he committed after he became a monk and dedicated himself to God. While making their accusations the demons pronounced many brazen lies; but since their slander was unfounded, a free path was opened to Anthony. He then immediately came to himself and saw that he was standing in the same place that he had stood for prayer. Forgetting all about food, he spent the entire night in tears and lamentations, pondering on the multitude of mankind’s enemies, on the struggle with such an army, and the difficult path to heaven through the air. - St. Athanasius life of St. Anthony the Great.
When the soul leaves the body, the enemy advances to attck it, fiercely reviling it and accusing it of its sins in a harsh and terrifying manner. But if a soul enjoys the love of God and has faith in Him, even though in the past it has often been wounded by sin, it is not frightened by the enemy’s attacks and threat. - St. John Karpathos Texts for the Monks of India Philokalia vol 1.
We'll find out for sure one day, though, and I'm in no hurry. 
