This is true, but if memory serves, there is an indulgence attached to saying this prayer before a crucifix.
That indulgence was changed from number 22 to number 8; it is plenary on Lenten Fridays, after communion, before a crucifix, under the usual conditions:
Behold, O kind and most sweet Jesus,
I cast myself upon my knees in thy sight,
and with the most fervent desire of my soul
I pray and beseech thee
that thou wouldst impress upon my heart
lively sentiments of faith, hope and charity,
with true contrition for my sins,
and a firm purpose of amendment;
while with deep affection and grief of soul
I ponder within myself and mentally contemplate
thy five wounds,
having before my eyes
the words which David the prophet,
put on thy lips concerning thee:
“My hands and my feet they have pierced,
they have numbered all my bones.”
That prayer may be devoutly used to obtain a partial indulgence after communion at other times even without a crucifix. (Also concession 8.) Concession 14 is a partial indulgence to the faithful who devoutly use a cross or crucifix, medal, or rosary. The degree of a partial indulgence is in proportion to the perfection of the performance of the devotion and to the degree of greater charity of the performer.
The current document with indulgences is available as Manual of Indulgences, USCCB 2006.
usccbpublishing.org/productdetails.cfm?sku=5-474